Some economists agree that a credible incomes policy would help prevent inflation. However, by arbitrarily interfering with price signals, it provides an additional bar to achieving economic efficiency, potentially leading to shortages and declines in the quality of goods on the market and requiring large government bureaucracies for enforcement. That happened in the United States during the early 1970s. When the price of a good is lowered artificially, it creates less supply and more demand for the product, thereby creating shortages.