One of the particular features of poor countries’ economies is their volatility, due mostly to their dependence on commodities. The paper shows that this volatility is a prime factor behind the debt crises of the poorest countries. It advocates the adoption by donors of a new lending instrument: the countercyclical loan (CCL). The key idea is to reduce the grace period of a typical concessional loan, from 10 to 5 years, and to keep the remaining grace periods as an asset that the country can draw upon, when a bad shock occurs. If no such bad shocks happen, or infrequently enough, the “floating grace” is redeemed to the country at the end of the loan as a repayment in advance without penalties.