African economies finance themselves through four main external channels. Each behaves differently under stress, and understanding which dominates in a given country tells you a lot about its vulnerability profile.
The four channels
- Foreign Direct Investment (FDI) — long-term equity stakes in real assets; sticky, productive, but slow to mobilize
- Portfolio flows — purchases of bonds and equities by foreign investors; fast, sensitive to global rates and risk appetite
- Eurobonds — sovereign and corporate dollar-denominated bonds issued in international markets
- Remittances — diaspora transfers home; stable, large for some countries, the least cyclical of the four
Eurobonds — the past decade's defining trend
Pre-2007, only South Africa and a handful of others had regular eurobond access. After the global financial crisis, ultra-low developed-market rates pushed yield-hungry investors into frontier debt. Ghana issued in 2007, Senegal in 2009, Nigeria in 2011, Kenya in 2014. By 2020, more than 20 African sovereigns had eurobonds outstanding.
The benefit: longer maturities, larger size, no IMF conditionality. The cost: dollar-denominated, currency-mismatched, and subject to sudden global risk-off events. The 2022 Fed hiking cycle effectively closed the eurobond market to most African issuers, exposing those who had become reliant on rollover financing.
The currency mismatch trap
Eurobonds pay coupons in dollars but governments collect taxes in local currency. When the local currency depreciates, the cost of servicing eurobond debt rises in local-currency terms — even though the debt itself hasn't changed. A 30% depreciation effectively expands eurobond debt by 30%.
Portfolio flows — fast money
Portfolio investors hold local-currency bonds and equities. They can exit in days. When global risk appetite shifts — say, after a Fed hike or a regional shock — outflows can be massive and self-reinforcing: outflows weaken the currency, weaker currency triggers more outflows. The 'sudden stop' is when this loop breaks the financing model.
FDI — sticky but selective
FDI tends to follow real opportunities — natural resources, telecoms, finance, increasingly tech. It's the least volatile capital flow. But it's also concentrated by sector and country: a handful of resource exporters and the largest economies (Nigeria, Egypt, South Africa, Morocco, Kenya) get most of it.
Remittances — the unsung hero
For many African countries, remittances exceed FDI. Kenya, Nigeria, Senegal, Egypt all receive over $5B/year. They're countercyclical (diaspora often increases support during home-country distress), don't create debt, and reach households directly. The unglamorous truth: remittances are often the single largest source of foreign exchange for African economies.
The 2022-23 sudden stop
When the Fed went from 0% to 5.25% in 18 months, capital that had been chasing yield in frontier markets reversed sharply. Eurobond yields for African sovereigns blew out to 12-20% in some cases — effectively closing market access. Countries with refinancing needs in 2023 had to either go to the IMF (Ghana, Egypt, Kenya) or absorb fiscal pain. Few had a third option.
What to watch
When yields on a sovereign's eurobonds rise above ~10%, market access is becoming conditional. Above 13-15%, it's effectively closed. The country either grits through, raises domestically (often crowding out private credit), or seeks a program. Watch the secondary market yields, not just the official communication.
Exercise
Kenya's external-financing picture, mid-2025: FDI USD 800m/year, eurobond market access available at ~9-10% yields, remittances USD 4.5bn/year, IMF programme delivering USD 600m/year, multilateral concessional financing USD 1.5bn/year. The Treasury needs USD 4bn of external financing this fiscal year to cover the deficit and roll maturities. (1) Sum the available financing and assess feasibility. (2) Which sources are stickiest and which are most volatile under stress? (3) If a global risk-off shock raises eurobond yields to 14-15%, what specific moves does Kenya have to fill the gap? (4) Why does Kenya prioritise building reserves in calm years even though it's expensive?