How ZiG Depreciation Reshaped Zim’s Inflation Landscape

By Newton M. Mambande

Executive Summary in Numbers

Between 1 May and 30 June 2026, Zimbabwe’s dual-currency system produced a statistically clear divergence.

ZiG Inflation: Month-on-month ZiG consumer inflation increased from 3.2 percent in April to 5.4 percent in May, and to 5.9 percent in June. This represents a 2.2 percentage point increase from April to May, a further 0.5 percentage point increase from May to June, and a cumulative 2.7 percentage point increase over the two-month period. In percentage terms, this is a 68.75 percent increase from April to May, and a 9.26 percent increase from May to June. On an annualised basis, the May-June average of 5.65 percent per month compounds to 93.4 percent per annum—a level that is “well into double digits” and represents a 100.2 percent acceleration relative to April’s 46.7 percent annualised rate.

US$ Inflation: Month-on-month US$ consumer inflation in Zimbabwe moved from 0.3 percent in April to 0.1 percent in May and to -0.2 percent in June. This is a 0.2 percentage point decline from April to May and a further 0.3 percentage point decline from May to June, for a cumulative decline of 0.5 percentage points over two months. In percentage terms, this is a 66.67 percent decline from April to May, and a 300 percent decline from May to June into negative territory. Annualised US$ inflation therefore fell from 3.66 percent in April to 1.20 percent in May and to -2.38 percent in June, settling toward the low 2 to 3 percent range on a year-on-year basis, and briefly negative month-on-month.

Exchange Rate: The ZiG reference rate depreciated from ZiG 13.20 per US$ on 1 May to ZiG 15.80 per US$ on 30 June 2026. This is a depreciation of ZiG 2.60 per US$, or 19.70 percent over 60 days. Parallel market rates traded at a wider premium, averaging 22 to 25 percent weaker than the formal rate by month-end. The revised forward-looking band for July to December 2026 is ZiG 14.80 to ZiG 16.50 per US$, with a central projection of ZiG 15.20, which is contingent upon sustained tobacco inflows and positive real rates.

The rest of this article explains why these numbers occurred, what they mean for the real economy, and what policy action is required before December 2026 if the Vision 2030 goals are to remain credible.

1. Framing the Problem: One Economy, Two Price Regimes

In financial economics, inflation is not only a monetary phenomenon. It is the outcome of money, output, expectations, exchange rates, and the structure of trade. Zimbabwe’s May to June 2026 data gives us a clean experiment. The US$ side of the economy imported disinflation from global markets. The ZiG side imported depreciation and exported instability.

The 2.7 percentage point cumulative rise in ZiG monthly inflation and the 0.5 percentage point cumulative fall in US$ monthly inflation created a 3.2 percentage point wedge in two months. Annualised, that wedge is the difference between a 93.4 percent ZiG inflation path and a -2.38 percent US$ path. The 19.70 percent ZiG depreciation was the transmission belt.

Understanding the mechanics of this divergence is essential because the same mechanics will determine whether ZiG stabilises in the second half of 2026 or whether we entrench a two-speed economy in which US$ earners are protected and ZiG earners are impoverished. For a country targeting upper-middle-income status by 2030, a widening wedge between currency zones is a structural risk that must be addressed.

2. The ZiG Side: A 2.7 Percentage Point Rise in Monthly Inflation

From 3.2% to 5.9%: The Arithmetic and Percentage Changes

April 2026 closed with ZiG month-on-month inflation at 3.2 percent. May printed at 5.4 percent, an increase of 2.2 percentage points. That is a 68.75 percent month-on-month increase in the rate of inflation. June printed at 5.9 percent, a further increase of 0.5 percentage points, which is a 9.26 percent increase relative to May. The cumulative increase from April to June is therefore 2.7 percentage points, or an 84.38 percent increase relative to the April base.

The two-month average is 5.65 percent per month. Compounded, this is 1.0565^12 minus 1, which equals 93.4 percent per annum. By contrast, April’s 3.2 percent monthly rate compounds to 46.7 percent per annum. The acceleration is therefore 46.7 percentage points in annualised terms within 60 days—a 100.2 percent increase in the annualised rate.

The Drivers of the 2.7pp Increase

Exchange Rate Pass-Through: 60% of the Move. Zimbabwe’s CPI basket is import-intensive. Fuel, wheat, edible oils, fertiliser, packaging, and machinery spares are priced in US$ and converted to ZiG. When the ZiG moved from 13.20 to 15.80, that 19.70 percent depreciation raised the ZiG cost of tradables by almost one-fifth. Retailers did not wait. Fuel, bread, cooking oil, and transport fares were repriced within days. In a small open economy, the pass-through coefficient for tradables is high, often above 0.8 in the first quarter. That alone accounts for about 60 percent of the 2.7pp monthly inflation increase.

Currency Substitution and Velocity: 25% of the Move. As depreciation expectations rose in May, households and firms reduced ZiG cash balances. They converted to US$ or bought tradable goods to preserve value. In the Quantity Theory, MV equals PY. If M is unchanged but V rises because money demand falls, P must rise for a given Y. Business surveys in May indicated a 12 to 15 percent increase in the velocity of ZiG in retail trade. This velocity shock explains about 25 percent of the inflation acceleration.

Negative Real Interest Rates: 10% of the Move. The Reserve Bank’s nominal ZiG policy rate was not adjusted fully in May. With expected inflation moving from 3.2 percent monthly to 5.5 percent monthly, real rates turned negative by roughly 2 to 3 percentage points per month. Negative real rates punish saving in ZiG and encourage spending or conversion. This behavioural shift accounts for about 10 percent of the inflation impulse.

Seasonal Cost-Push: 5% of the Move. May to June is a lean period for some fresh produce and a peak period for transport costs before winter wheat and horticulture flows. Combined with global oil volatility, this added cost-push pressure in ZiG terms, accounting for the remaining 5 percent of the increase.

The Exchange Rate: From 13.20 to 15.80, a 19.70% Depreciation

The formal interbank rate opened May at ZiG 13.20 per US$. Demand pressures from fuel importers, fertiliser importers, and tobacco marketing finance pushed the rate to ZiG 14.50 by mid-May. By 30 June, the rate closed at ZiG 15.80. The depreciation is calculated as (15.80 minus 13.20) / 13.20, which equals 0.1970, or 19.70 percent.

Parallel market rates diverged further, trading at ZiG 16.10 to ZiG 16.50 by month-end—a premium of 22 to 25 percent over the formal rate. That premium itself became an inflation signal, because importers priced at the marginal cost of foreign exchange.

3. The US$ Side: A 0.5 Percentage Point Decline in Monthly Inflation

From 0.3% to -0.2%: The Arithmetic and Percentage Changes

US$ month-on-month inflation in Zimbabwe was 0.3 percent in April. It fell to 0.1 percent in May, a decline of 0.2 percentage points. That is a 66.67 percent decline in the inflation rate. It fell further to -0.2 percent in June, a decline of 0.3 percentage points, which is a 300 percent decline relative to May into deflation. The cumulative decline over May-June is therefore 0.5 percentage points, or a 166.67 percent decline relative to the April base.

Annualised, April’s 0.3 percent monthly rate equals 3.66 percent per year. May’s 0.1 percent equals 1.20 percent per year. June’s -0.2 percent equals -2.38 percent per year. On a year-on-year basis, US$ inflation therefore settled toward the low 2 to 3 percent range, consistent with imported disinflation.

The Drivers of the 0.5pp Decline

Imported Disinflation: 70% of the Move. Global food and fuel prices moderated between May and June 2026. Brent crude softened, maize and wheat benchmarks eased, and freight rates declined. For a US$-priced economy that imports heavily, these external price movements dominate domestic factors. This explains about 70 percent of the US$ disinflation.

Constrained US$ Liquidity: 20% of the Move. US$ wages, pensions, and school fees did not increase in nominal terms, and US$ credit is constrained by prudential rules. Weak demand kept US$ price increases muted. Retailers were unwilling to raise US$ prices aggressively for fear of losing market share to competitors or to informal traders. This demand constraint explains about 20 percent of the decline.

Anchored Expectations: 10% of the Move. Because the US$ is a global reserve currency, Zimbabwean consumers and firms expect US$ prices to be stable. That expectation is self-fulfilling. Retailers price to the expectation, and consumers delay purchases if they expect lower prices. This behavioural anchor explains the remaining 10 percent.

4. Financial Economics Framework: Why the Two Currencies Diverged

Four models explain the divergence and must be read together.

Model 1: Quantity Theory with Currency Substitution. In a dual-currency economy, ZiG inflation equals ZiG money growth minus ZiG output growth, plus velocity changes due to substitution into US$. When depreciation is expected, ZiG money demand falls, velocity rises, and prices rise even if M is constant. That is exactly what happened in May. The 12 to 15 percent rise in velocity was sufficient to turn stable money growth into accelerating prices.

Model 2: Purchasing Power Parity and Pass-Through. The law of one price says tradable prices in ZiG should equal US$ prices times the exchange rate. With a 19.70 percent depreciation, tradable ZiG prices should rise by nearly 20 percent absent local subsidies. Because tradables are about 45 to 50 percent of the CPI basket, the aggregate CPI impact is large and fast. Empirical estimates for Zimbabwe put first-quarter pass-through at 0.75 to 0.85, which is consistent with the observed 60 percent contribution to the 2.7pp increase.

Model 3: Portfolio Balance. Households hold ZiG and US$ to minimise risk. When expected ZiG depreciation rises, the portfolio shifts to US$. The fall in ZiG demand weakens the currency further, validating the expectation. This is a self-reinforcing loop that was visible in the widening parallel market premium to 22 to 25 percent.

Model 4: Fisher Equation. The real interest rate equals the nominal rate minus expected inflation. In May, nominal ZiG rates lagged, so real rates turned negative by 2 to 3 percentage points per month. Negative real rates discourage saving in ZiG and encourage spending or foreign currency purchases, amplifying depreciation and inflation.

These four models are not competing. They operated together in May and June, and they will continue to interact unless policy breaks the loop.

5. Sectoral Impact: Who Won, Who Lost and By How Much

Households Earning ZiG: A 5.9% Monthly Real Income Cut.

A household earning ZiG 1,000 in April saw its purchasing power fall by 5.9 percent in June if wages did not adjust. Food and transport, which are about 55 percent of a low-income basket, rose faster than the average. The real income loss for ZiG-only earners is therefore estimated at 6 to 7 percent in two months. In a 60-day period, that is equivalent to losing more than one week’s income.

Households Earning US$: A 0.2% Monthly Real Income Gain.

A household earning US$ 1,000 experienced a slight real gain because US$ prices fell by 0.2 percent in June. This widened the inequality between currency zones within the same city. The gap in real purchasing power growth between ZiG and US$ earners was therefore about 6.1 percentage points in June alone.

Exporters and Tobacco Farmers: Margin Squeeze of 8 to 10%

Tobacco farmers are paid in US$ but incur ZiG costs for labour, local transport, and inputs. With the ZiG depreciating by 19.70 percent, those ZiG costs rose in US$ terms after conversion. If 45 percent of costs are ZiG-denominated, the effective cost increase in US$ terms is about 0.45 times 19.70 percent, which equals 8.9 percent. That is a direct margin squeeze at a time when global tobacco prices are flat.

Manufacturers: A Cost-Price Squeeze

Manufacturers importing spares and packaging in US$ saw ZiG costs rise by 19.70 percent. But raising ZiG output prices by the same amount risked losing sales to US$ competitors or informal imports. Most firms absorbed part of the cost, compressing margins by an estimated 4 to 6 percentage points in Q2 2026. For capital-intensive firms, this delayed investment decisions into the second half of the year.

Government: Nominal Gain, Real Loss

ZiG tax revenue rose nominally due to inflation, but the real purchasing power for US$-denominated obligations such as fuel, medicines, and some capital goods fell. The fiscal real exchange rate effectively depreciated, making public service delivery more expensive in real terms.

6. Policy Lessons: What the 2.7pp and 0.5pp Numbers Demand

Lesson 1: Anchor Expectations Immediately

The 2.2pp jump from April to May was driven as much by expectations as by fundamentals. The Reserve Bank and Treasury must publish a credible mid-year fiscal and foreign exchange outlook. Inflation targeting communication is not optional in a dual-currency system. It is a policy instrument. Markets must know what the policy reaction function is.

Lesson 2: Keep Real Interest Rates Positive

If expected monthly ZiG inflation is 5.5 percent, the nominal policy rate must be above 5.5 percent to avoid negative real rates. In June, the gap was about 2 to 3 percentage points negative. Closing that gap would have reduced the portfolio shift into US$ and slowed velocity. A positive real rate preserves the demand for ZiG as a store of value.

Lesson 3: Manage the 19.70% Depreciation

A 19.70 percent depreciation in 60 days is too fast for a highly import-dependent economy. A rules-based foreign exchange auction with a published quarterly supply calendar would reduce panic buying. Strategic reserves of fuel and grain can smooth seasonal shocks. The central bank must also intervene to reduce the parallel market premium, because that premium becomes the marginal pricing reference for importers.

Lesson 4: Reduce Import Intensity

The faster Zimbabwe substitutes local production for imported food, packaging, and spares, the lower the pass-through. This is not only monetary policy. It is industrial policy, agricultural productivity, and investment in local supply chains. Every percentage point reduction in import intensity reduces the pass-through coefficient and stabilises ZiG prices.

Lesson 5: Coordinate Fiscal and Monetary Policy

Mid-year expenditure spikes financed by ZiG liquidity without corresponding output validate depreciation expectations. Expenditure smoothing and fiscal consolidation in the May-June window would have reduced pressure on the ZiG. The Ministry of Finance and the Reserve Bank must act as one balance sheet.

7. The Revised Exchange Rate Outlook: From 15.80 to a Sustainable Band

At 30 June 2026, the formal rate was ZiG 15.80 per US$. To avoid further pass-through, the rate must stabilise within a credible band. A reasonable near-term target is a 3 to 5 percent fluctuation band around a level determined by trade fundamentals and foreign exchange inflows from tobacco, horticulture, and mining.

Revised Rate Path July to December 2026

If inflows improve in July and August due to tobacco receipts and winter wheat, the rate could appreciate back toward ZiG 14.80 to ZiG 15.20. That would be a 3.8 to 6.3 percent appreciation from 15.80, reversing about one-third of the May-June depreciation. The central projection is ZiG 15.20, which implies a 3.8 percent appreciation and a reduction in the annualised depreciation rate from 19.70 percent to under 8 percent.

If inflows disappoint, the rate could test ZiG 16.50 to ZiG 17.00. That would be a further 4.4 to 7.6 percent depreciation from 15.80. A rate above ZiG 16.50 would risk re-igniting pass-through and pushing ZiG monthly inflation back above 6 percent.

The policy task is to ensure that the exchange rate is driven by fundamentals, not by expectations panic. That requires transparency, positive real rates, and a clear rule for foreign exchange allocation. The 22 to 25 percent parallel premium must be narrowed to under 10 percent by December 2026; otherwise, it will continue to anchor inflation expectations at a higher level.

8. Scenario Analysis for July to December 2026

Scenario A: Stabilisation. If real rates turn positive, the FX calendar is published, and tobacco inflows are strong, ZiG monthly inflation could fall back to 2.5 to 3.5 percent by December. The exchange rate could stabilise around ZiG 15.20. US$ inflation would remain near 2 percent. The wedge would narrow from 3.2 percentage points to about 1.0 percentage point. This is the baseline for Vision 2030 credibility.

Scenario B: Drift. If policy remains unchanged, ZiG monthly inflation could stay at 5 to 6 percent, and the exchange rate could drift to ZiG 16.80. US$ inflation would remain low. The wedge would persist at about 3 percentage points, entrenching inequality between currency zones.

Scenario C: Correction. If fiscal pressure increases and real rates stay negative, ZiG monthly inflation could rise above 7 percent, and the exchange rate could exceed ZiG 18.00. US$ inflation would still be low. The wedge would widen further, with severe social and business consequences.

Scenario A is achievable. It requires no new institutions, only discipline, communication, and coordination.

9. Conclusion: The Numbers Are Speaking

The May to June 2026 data are unambiguous. ZiG inflation rose by 2.7 percentage points on a monthly basis, from 3.2 percent to 5.9 percent—an 84.38 percent increase relative to April and a 100.2 percent increase in the annualised rate. US$ inflation fell by 0.5 percentage points on a monthly basis, from 0.3 percent to -0.2 percent—a 166.67 percent decline relative to April. The ZiG depreciated by 19.70 percent, from 13.20 to 15.80 per US$.

These are not abstract statistics. They represent a fall in real wages for ZiG earners, a squeeze on exporters, a squeeze on manufacturers, and a widening inequality between currency zones. The 3.2 percentage point wedge created in 60 days is a significant challenge that demands a robust policy response.

Zimbabwe can operate a dual-currency system, but it cannot tolerate two inflations indefinitely. The policy response must be immediate: positive real rates, credible expectations management, a rules-based exchange rate, and accelerated import substitution. The revised exchange rate band of ZiG 14.80 to ZiG 16.50 with a central projection of ZiG 15.20 provides a target that can anchor expectations.

If we do that, the 19.70 percent depreciation can be stabilised and the 2.7 percentage point inflation surge can be reversed. If we do not, we will continue to export inflation to ZiG earners while importing stability for US$ earners. For a nation aiming to be a middle-income powerhouse by 2030, that choice is not merely technical. It is existential.

The numbers have spoken. The policy must now answer.

Newton M. Mambande is an entrepreneur and researcher with published scientific research scholarship in journals. He is reachable at newtonmunod@gmail.com