Falling prices can be bad news for an economy
Cheaper goods sound like a gift, but economists worry when prices across a whole economy fall. If you expect things to cost less next month, you wait to buy. Sales drop, factories sit idle, investment dries up, and prices slide further, a loop known as the deflationary spiral.
Deflation means the general price level falls, so each unit of money buys more. It differs from disinflation, where inflation merely slows but stays above zero; deflation begins when the rate goes negative. Economists treat it largely as a monetary matter, tied to how much money circulates and how quickly it changes hands relative to what the economy produces. When the money supply is fixed or grows more slowly than population and output, falling prices are the natural result.
The main danger is debt. Deflation raises the real burden of what borrowers owe, especially when it comes as a surprise, and lenders that fund themselves with short-term borrowing can be squeezed. People start hoarding money because it is gaining value, which can deepen a recession. In 1933 Irving Fisher proposed his theory of debt deflation to explain the collapse of prices in the Great Depression. The quick remedies are stimulus: government spending on things like infrastructure, or a central bank expanding the money supply.
Not every episode is harmful. From the 1870s until an upswing began in 1895, falling production and transport costs drove a long structural deflation, with competitive price cuts in oversupplied markets. Economists call this kind growth deflation: technology makes things cheaper and demand rises. A 1940 Brookings Institution study linked persistent deflation between the wars to enormous productivity gains in American industry.
Deflation returned after the First World War and during the 1930s. Once most nations abandoned the gold standard that decade, there was less reason to expect it under paper money, apart from collapses in speculative assets. Monetary shifts also act slowly: a rule of thumb puts the lag before prices respond at 18 months or more, and Alan Greenspan once put it at 12 to 13 quarters.
Source: Deflation
