Procyclical and countercyclical are terms used to describe how an economic quantity is related to economic fluctuations. Their meanings may vary with regard to business cycle theory and economic policy making.
The terms are often used loosely to describe a government's approach to spending and taxation. A 'procyclical fiscal policy' can be summarised simply as governments choosing to increase public spending and reduce taxes during an economic boom, but reduce spending and increase taxes during a recession. A 'countercyclical' fiscal policy refers to the opposite approach: reducing spending and raising taxes during a boom period, and increasing spending/cutting taxes during a recession.
In business cycle theory and finance, any economic quantity that is positively correlated with the overall state of the economy is said to be procyclical. That is, any quantity that tends to increase in expansion and tend to decrease in recession is classified as procyclical. Gross Domestic Product (GDP) is an example of a procyclical economic indicator. Many stock prices are also procyclical, because they tend to increase when the economy is growing quickly.
Conversely, any economic quantity that is negatively correlated with the overall state of the economy is said to be countercyclical. That is, quantities that tend to increase when the overall economy is slowing down are classified as 'countercyclical'. Unemployment is an example of a countercyclical variable. Similarly, business failures and stock market prices tend to be countercyclical. In finance, an asset that tends to do well while the economy as a whole is doing poorly is referred to as countercyclical, and could be for example a business or a financial instrument whose value is derived from sales of an inferior good.
Procyclical has a different meaning in the context of economic policy. In this context, it refers to any aspect of economic policy that could magnify economic or financial fluctuations. Of course, since effects of particular policies are often uncertain or disputed, a policy will be often procyclical, counter cyclical or acyclical according to the view of the one judging it.
Thus the financial regulations of the Basel II Accord have been criticized for their possible procyclicality. The accord requires banks to increase their capital ratios when they face greater risks. Unfortunately, this may require them to lend less during a recession or a credit crunch, which could aggravate the downturn. A similar criticism has been directed at fair value accounting rules. The effect of the single Eurozone interest rate on the relatively high-inflation countries in the Eurozone periphery is also pro-cyclical, leading to very low or even negative real interest rates during an upturn which magnifies the boom (e.g. 'Celtic Tiger' upturn in Ireland) and property and asset price bubbles whose subsequent bust magnifies the downturns.