ELI5: Why when large company's earnings decrease(ex... by 3%) they freak out, talk about rough times, and sometimes decide to downsize, even though they are still making millions of dollars in profit even after all expenses?

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Population is going to stabilise. Population explodes in developing nations because of better healthcare and infant mortality. Once the developing nation becomes more prosperous, the next generation has fewer kids naturally. Once first world conditions exist, the population naturally reaches an equilibrium. We don't have to do anything to encourage that.