Why Is USD Scarce in Africa? The Mechanism Behind the Dollar Shortage

Last updated: June 2026. Market-data figures are stamped with their source date; this article explains an economic mechanism and is not financial, investment, or legal advice.

A dollar shortage is a mechanism, not a mood. When a country spends more foreign currency on imports than it earns from exports, demand for dollars chronically outruns supply — and as central-bank reserves thin, the gap shows up as queues, premiums, and stalled trade. Nigeria's queue alone reached a claimed ~$7 billion FX backlog before the central bank cleared the valid portion in March 2024 (Bloomberg). This page walks that machine step by step: current-account deficit, falling reserves, the FX allocation queue, the collapse of import letters of credit, and the parallel-market spread — each step pinned to a primary source dated to 2024 or 2025.

This is the why — the plumbing. It is not a guide to working around the shortage; for the three rails businesses use to settle anyway, see the pillar hub on the dollar shortage in Africa. Here, we stay with the cause.

Why is USD scarce in Africa?

Dollars are scarce because many African economies spend more foreign currency on imports than they earn from exports, so demand for dollars chronically outruns supply while reserves shrink at the same time. The dollar is the currency most cross-border trade is invoiced and settled in, so a Nigerian or Egyptian importer paying a supplier in China, India, or the UAE needs physical dollars — not local currency — to close the deal. When the central bank cannot supply enough of them, businesses wait, pay a premium, or both.

The shortage is real and measurable. Sub-Saharan Africa is the world's costliest region to move money, at 8.4–8.78% to send $200 (versus 6.49% globally), per the World Bank's Remittance Prices Worldwide, Q2-2024 / Q1-2025 — a cost that rises directly when dollars are rationed. And the pipes that carry dollars into the region have been narrowing: USD correspondent-banking relationships in Africa are down 25.1% since 2011 (up to −40.6% in North Africa), according to the Financial Stability Board. Fewer dollar pipes, more dollar demand — that is the squeeze.

What causes a dollar shortage in the first place?

Three forces combine: a persistent current-account deficit, capital flight, and falling foreign-exchange reserves. Each on its own strains dollar supply; together they produce the chronic scarcity that defines a dollar-short economy.

• A persistent current-account deficit. The country buys more goods and services from abroad than it sells. Every month of deficit is a month of net dollar outflow that has to be financed from somewhere — reserves, borrowing, or remittances.
• Capital flight. When confidence falls, residents and foreign investors move money out — converting local currency to dollars and sending them offshore. That drains the same dollar pool importers are queuing for.
• Falling foreign-exchange reserves. Central banks hold reserves to smooth these gaps. When the deficit and outflows run faster than export earnings and inflows replenish them, the buffer shrinks — and the central bank begins to ration what dollars remain.

When all three run at once, the central bank can no longer meet dollar demand at the official rate. It starts to allocate — and the moment it allocates, a queue forms.

What is an FX allocation queue (backlog)?

An FX allocation queue — also called an FX backlog — is the waiting line businesses join when the central bank rations limited dollars instead of selling them freely at the official rate. Rather than buy dollars on demand, an importer applies through a bank, the application sits against a pool of dollars the central bank releases in batches, and approvals come out in the order — and at the pace — the central bank can fund. The backlog is the dollar value of approved-but-unpaid demand stacked up in that line.

Nigeria is the clearest illustration. The Central Bank of Nigeria inherited a claimed FX backlog of roughly $7 billion; a forensic audit by Deloitte found about $2.4 billion of those claims to be invalid, and the CBN cleared the remaining valid claims by March 2024, as Bloomberg reported. The pressure on the naira through this period was severe: the currency lost roughly half its value over 2023 and a further 37.6% in January 2024 alone, per Nairametrics. A backlog is simply scarcity made visible — demand the central bank acknowledged but could not fund on time.

How does a dollar shortage make import letters of credit dry up?

When banks cannot source dollars, they stop issuing letters of credit — the bank guarantee that underwrites most cross-border trade — and import volumes collapse with them. A letter of credit commits the importer's bank to pay the overseas supplier once shipping terms are met; if the bank has no reliable path to dollars, it cannot make that commitment, so the instrument simply stops being available.

The numbers are stark. In Nigeria, the value of import letters of credit fell about 57% in the first seven months of 2024 versus the same period a year earlier, from $912.35 million to $391.91 million, according to the Punch, citing CBN data. Egypt shows the same mechanism from a different angle: a 2022 rule requiring letters of credit for most imports, layered onto a dollar crunch, stranded an estimated $9.5 billion of goods at port for roughly a year, as the Maritime Executive documented. Egypt only began clearing that backlog after the IMF augmented its Extended Fund Facility to $8 billion in March 2024 — explicitly to clear "the current backlog of unmet foreign exchange demand" via a unified, flexible exchange rate, per the IMF Executive Board's March 29, 2024 statement — a move accompanied by a roughly 40% devaluation of the pound that month, as the Maritime Executive reported. When the dollar dries up, the trade-finance instrument that depends on it dries up first.

What is the parallel-market (black-market) spread?

The parallel-market spread is the gap between the official dollar exchange rate and the "street" rate businesses actually pay when official dollars run out — and it is a direct measure of how acute the shortage is. When the central bank rations dollars at an artificially strong official rate, a parallel market forms where dollars trade at their true scarcity price. The wider the gap, the more severe the rationing.

The spread matters because it reveals the real cost of the shortage. An importer who cannot get an official allocation does not stop importing — they source dollars on the parallel market at a worse rate, and that premium flows straight into landed costs and consumer prices. A persistent double-digit spread is the market's verdict that the official rate is fiction and dollars are genuinely scarce. It is why currency reforms in dollar-short economies almost always begin by letting the official rate move toward the parallel rate — closing the spread is how a central bank admits the true price of dollars.

How many months of import cover do African reserves hold?

Reserve adequacy is measured in months of import cover — how many months of imports a country's reserves could pay for — against a rough 3-month benchmark the IMF commonly uses as a floor for adequacy. When a country's reserves fall below roughly three months of import cover, the central bank can no longer smooth a bad month, and rationing begins. During dollar-stress episodes, several African central banks have run at or below that benchmark — precisely when allocation queues lengthen and the parallel-market spread widens.

Import cover is the buffer between "the central bank can smooth a bad month" and "the central bank must ration." As reserves fall toward and below the 3-month line, the buffer thins, and the rationing that creates the backlog begins. Live import-cover figures move week to week and are only meaningful when read against a current date from the relevant central bank or IMF release, so always check the latest reported figure for a specific country — but the benchmark, and the downward direction of travel during a crunch, are the durable signal.

Country-pair trade exposure — where the dollar demand comes from

The dollar shortage is, at bottom, a gap between dollar demand and dollar supply — and the demand side is concrete: large, dollar-invoiced trade with a handful of major partners, whose import leg is what generates the dollar demand. The table below shows the scale of those bilateral flows; the import portion of each is the bill the mechanism above struggles to fund. China alone exported a record $225.03 billion to Africa in 2025 (+25.8%), per GACC data reported by Ecofin Agency — the single largest source of inbound dollar demand on the continent.

These are the bilateral trade volumes behind the scarcity, labelled by direction and year:

Every flow in that table has an import leg that must clear a dollar-short FX system. Nigeria's roughly $21.9 billion two-way trade with China and Egypt's $17.4 billion are both from SAIS-CARI's China-Africa trade dataset (2024); Brazil's $3.9 billion (+72%) of exports into Egypt are from Brazil's ComexStat (2024). The larger the import bill and the thinner the reserves behind it, the more acute the queue. For the corridor that generates the most concentrated dollar demand, see how the China–Nigeria trade dollar gap plays out at the single-country level.

Which African countries face the worst dollar scarcity, and why?

Nigeria, Egypt, Angola, Ethiopia, and Zimbabwe show the sharpest dollar scarcity — each driven by some mix of heavy import dependence, weak or commodity-concentrated export earnings, and thin reserves. The mechanism is the same everywhere; what differs is which input dominates.

• Nigeria — import-dependent with oil-concentrated, underperforming export receipts. The result was the roughly $7 billion FX backlog cleared in March 2024 (Bloomberg) and a roughly 57% drop in import letters of credit in early 2024 (the Punch, citing CBN).
• Egypt — a structurally large import bill against periodic capital-flight episodes; the 2022 letter-of-credit mandate stranded ~$9.5 billion of goods at port, only easing after the March 2024 IMF deal and devaluation, per the Maritime Executive.
• Angola — commodity-concentrated exports (oil) leave dollar earnings hostage to one price, while machinery and consumer-goods imports run steadily; China alone shipped roughly $3.2 billion into Angola in 2024, per SAIS-CARI.
• Ethiopia — chronic import cover pressure against a narrow export base; two-way trade with China alone reached $4.90 billion (+17.5%) in 2024, per SAIS-CARI.
• Zimbabwe — a long history of currency instability and a structurally wide parallel-market spread, the textbook case of the official rate detaching from the street rate.

Across all five, the supply side is squeezed by the same continent-wide trend: SSA remains the costliest region to move money at 8.4–8.78% per $200 (World Bank RPW, Q2-2024 / Q1-2025), and USD correspondent relationships are down 25.1% since 2011 (FSB). Fewer pipes, costlier flows, thinner reserves — the mechanism, not the geography, is what these countries share.

Further reading (reference): the country-level detail behind Nigeria's FX queue — backlog history, naira moves, and dollar-access options — is collected on the Artoh Nigeria page.

Common questions

Is a dollar shortage the same as a weak local currency?
No, though they travel together. A dollar shortage is a quantity problem — not enough dollars to meet demand at any official price. A weak currency is a price problem. Rationing dollars at a strong official rate creates a parallel-market spread; letting the rate move closes the spread but does not, by itself, create more dollars.

Why don't businesses just pay suppliers in local currency?
Because an overseas supplier in China or the UAE needs hard currency they can use at home. Paying in naira or birr only moves the conversion bottleneck to whoever ends up holding the local currency. The constraint is sourcing dollars on a trade timeline, and local-currency payment does not remove it.

Does clearing a backlog end the shortage?
Not by itself. Clearing Nigeria's ~$7 billion backlog in March 2024 settled the accumulated demand, but the underlying current-account and reserve dynamics that created it persist — which is why backlogs can re-form unless export earnings, reserves, or both improve.

Is Africa's dollar shortage caused by sanctions or politics?
Generally no — the dominant driver is the structural trade-and-reserves mechanism described above. Political or confidence shocks can accelerate capital flight, which worsens the shortage, but the core cause is spending more foreign currency than the economy earns.

The bottom line

USD is scarce in Africa because the dollar demand created by import bills structurally outruns the dollar supply from exports, reserves, and inflows — and that imbalance expresses itself, in order, as falling reserves, an FX allocation queue, collapsing letters of credit, and a widening parallel-market spread. Every step in that chain is measurable, and every figure here is dated and sourced to a primary release. The mechanism is not mysterious; it is arithmetic under stress.

Understanding why dollars are scarce is the first half of the problem. The second half — what a business actually does to settle a supplier payment anyway — is a separate question entirely.

Understand your dollar exposure with Artoh

Once you understand why dollars are scarce, the next question is how to settle anyway. The mechanism on this page — import bills outrunning reserves, queues, and a parallel-market premium — is exactly the gap businesses are trying to route around. For the full menu of approaches, see the pillar on how businesses work around the dollar shortage; for the rail that addresses it most directly, see how stablecoins solve dollar shortages in Africa and how stablecoin settlement compares with SWIFT.

Artoh provides reliable USD liquidity and compliant settlement using regulated, Treasury-backed digital dollars — stablecoins held 1:1 against U.S. Treasuries and cash, moved through licensed channels with a full audit trail. That is settlement infrastructure, not crypto speculation, and it is built precisely for businesses whose supplier payments keep stalling behind the FX queue. If dollar scarcity is blocking your payments, let's talk.

Part of

The Dollar Shortage in Africa: Why Dollars Are Scarce — and the 3 Rails Businesses Use to Settle Anyway