According to John Horn, fluid intelligence steadily declines from middle adulthood onward. Fluid intelligence is described as ability to solve problems at the moment-navigated and adapt to a new situation. According to John Horn, there is a fluid and crystallized intelligence.
Answer:
Fluctuations in the economy is the correct answer.
Explanation:
<span>Falling prices for crops and livestock, large debts, decrease in need of food. </span>
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