Foehn wind Foehn wind A föhn or foehn (, ) is a type of dry, warm, down-slope wind that occurs in the lee (downwind side) of a mountain range. It is a rain shadow wind that results from the subsequent adiabatic warming of air that has dropped most of its moisture on windward slopes ("see" orographic lift). As a consequence of the different adiabatic lapse rates of moist and dry air, the air on the leeward slopes becomes warmer than equivalent elevations on the windward slopes. Föhn winds can raise temperatures by as much as 14 °C (25 °F) in just a
Zero-profit condition Zero-profit condition In economic competition theory, the zero-profit condition describes the condition that occurs when an industry or type of business has an extremely low (near-zero) cost of entry. In this situation, many people tend to join the industry, seeing the opportunity to make money, until there is no more money to make (supply exceeds demand); the large amount of competition limits each person's share of the market, as well as their ability to pursue a large profit margin. This would represent a situation of almost perfect competition. For instance, despite the real estate boom of the mid-2000s, the incomes