Which factor is most directly linked to the standard of living?

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The amount of effort we put into workThe availability of capital since machinery creates all valuable goodsOur level of productivity, as our earnings correspond to our outputThe quantity of natural resources, which restricts production

Explanation

The standard of living is primarily determined by productivity because the income people earn depends on the amount of goods and services they produce. While effort, capital, and natural resources influence production, productivity directly reflects how efficiently resources are used to generate income.