FT.com / Columnists / Martin Wolf - How imbalances led to cre...

Inflation is a sustained rise in the price level: the result of too much money (or purchasing power) chasing too few goods and services. A one-off jump in commodity prices is not inflation. Nor need such a jump cause inflation. But a continuous rise in the relative price of commodities is a symptom of an inflationary process.

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Most of these reserves were accumulated by countries more or less explicitly targeting the US dollar and accumulating US liabilities. The resulting capital flow financed the US trade and current account deficits. But a trade deficit is contractionary: for any given level of domestic demand, it lowers domestic output. Thus, the US needed to expand domestic demand, in order to offset the contractionary effect of the external deficits. Some groups within the economy needed to spend more than their incomes. The most important such group turned out to be households. Thus the growth in US household indebtedness that led to today’s “credit crunch” is a direct result of the global imbalances.

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