单选题 Those economists who believe that long- run inflationary bias will continue do so 1 the basis of the following factors: (1) Prices and wages tend to 2 during periods of boom in a competitive economy. This tendency is reinforced by wage contracts that provide escalator clauses to keep wages in 3 with prices trod by wage increases that are sometimes greater than 4 in productivity. (2) During recessions, prices tend to remain stable 5 decrease.