AP® Macroeconomics · Unit 6 · Topic 6.6
Linking Loanable Funds, Currency, and Net Exports
A chain links three markets: a rise in the real interest rate (loanable funds market) pulls in foreign capital, which bids up the currency (forex market), which makes exports pricier and net exports fall.
Start with the loanable funds market. If a government runs a bigger budget deficit, it borrows more, so the demand for loanable funds rises and the real interest rate rises. That higher real rate makes domestic bonds and assets more attractive to foreign savers than what they can earn at home. Foreign capital flows in to chase that higher return — net capital inflow rises.
But foreign savers cannot buy domestic bonds without first buying the domestic currency. That demand for the currency rises in the foreign exchange market, and the currency appreciates. A stronger currency makes exports more expensive to foreigners and imports cheaper at home, so exports fall, imports rise, and net exports shrink. This is the full loop: deficit → higher real interest rate → capital inflow → currency appreciation → lower net exports.
The two markets are really one story told from two sides. The loanable funds market sets the real interest rate that drives the capital flow; the foreign exchange market translates that capital flow into a price change for the currency, which then feeds back into the goods market through net exports. This is why a government deficit, something that looks purely domestic, ends up crowding out exporters abroad — the mechanism behind it is called financial crowding out through the exchange rate, and it connects directly to the balance of payments identity that net capital inflow must offset the current account.
Key terms
- Loanable funds market
- The market where savers supply funds and borrowers demand them, setting the real interest rate.
- Net capital inflow
- The net amount of foreign funds flowing in to buy domestic assets, rising with the domestic-foreign real interest rate gap.
- Currency appreciation
- A rise in a currency's value relative to others, making exports pricier abroad and imports cheaper at home.
- Net exports
- Exports minus imports, which falls when the currency appreciates.
- Crowding out (financial)
- When government borrowing raises interest rates and, through currency appreciation, displaces export demand.
Watch it explained
- How it worksWalk me through deficit spending raising the real rate, pulling in capital, and lifting the currency.
- Ties togetherHow do the loanable funds market and the foreign exchange market talk to each other?
- Going furtherWhat happens to net capital inflow and to net exports when the real interest rate rises?
- Common mistakeWhy doesn't a capital inflow always mean the country is winning?
Check yourself
End of topic.