Persistence is Group of answer choices
the tendency for declines in economic activity to be followed by further declines, and for growth in economic activity to be followed by more growth.
the tendency of many economic variables to move together in a predictable way over the business cycle.
the idea that the standard pattern of contraction—trough—expansion—peak occurs again and again in industrial economies.
the idea that peaks and troughs of the business cycle occur at regular intervals.

Aproduction line has three machines a, b, and c, with reliabilities of .96, .86, and .85, respectively. the machines are arranged so that if one breaks down, the others must shut down. engineers are weighing two alternative designs for increasing the line’s reliability. plan 1 involves adding an identical backup line, and plan 2 involves providing a backup for each machine. in either case, three machines (a, b, and c) would be used with reliabilities equal to the original three. a. compute overall system reliability under plan 1. (round your intermediate calculations and final answer to 4 decimal places.) reliability b. compute overall system reliability under plan 2. (round your intermediate calculations and final answer to 4 decimal places.) reliability c. which plan will provide the higher reliability? plan2plan1