A continuous decrease in the level of prices over time is called deflation. It involves the contraction of the supply of money in an economy. The opposite of such is inflation. During this time, the power of the currency and the wages are high than what is normal. It causes for capital, goods, services and labor costs to be lower. Monetary deflation can be caused by the decrease in supply of money or instruments that can be redeemed by money. In present, the supply of money is influenced by the central bank of each nation. Price deflation can be caused by a decrease in the demand of the goods and services and also increase in the productivity of the economy.