If the various Marias who own businesses are all confident that market conditions will be good and that there will continue to be enough customers with money to spend, then each of them will hire the various Wasilys, who in turn will see their income grow, allowing them to buy refrigerators, bicycles, or whatever it may be. In this manner the various Marias’ optimistic expectations will be fulfilled. Equally, if the various Marias are glum and expect poor sales, they will refrain from hiring the various Wasilys, incomes will continue to stagnate, the market for fridges will remain stuck in the doldrums, and, guess what, Maria and her fellow entrepreneurs will find their pessimism vindicated by reality.
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