Activists believe that . it takes a very long time to reach the long run frictions to the self-correcting mechanism of markets prevent prices and wages from being very flexible Keynes was right with his statement "in the long-run, we are all dead" all of the above none of the above

All of the above

Explanation:

The Long run is a period of time where all the factors of production of a firm are variable. For example, a firm can establish a bigger factory. It takes a longer period of time than the short run.

John Maynard Keynes also believed that in the long run, we are all dead. Also, an economy will self-correct because shocks matter in the short run and not the long run. The self-correction mechanism talks about price adjustment. When there is a shock, prices will adjust and the economy will be brought back to the long-run equilibrium.

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the answer would be voluntary exchange -

"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."

hope this : )

-shy