What is the most important factor in determining the elasticity of demand for a product in a given country?

Question

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The most important factor in determining the elasticity of demand for a product in a given country is the income level of its consumers. In general, products with higher prices will have more elastic demand in countries with lower average incomes because consumers are less willing and able to pay for them. Conversely, products with lower prices may have more inelastic demand in these countries because they are more affordable and necessary for everyday life.

What Is the Most Important Factor in Determining the Elasticity