People keep spending additional units of a particular resource on a want until their marginal benefit is their marginal cost.

People keep spending additional units of a particular resource on a want until their marginal benefit is less than their marginal cost.

Explanation:

The marginal principle is based on comparing the marginal benefits and costs of a given activity. The marginal benefit of some activity is the additional benefit resulting from a small increase in activity, such as, for example, the additional revenue generated when a barber shop is open for an additional hour. Similarly, marginal cost is the additional cost resulting from a small increase in activity, such as, for example, the additional costs incurred when keeping a store open for an additional hour.

Based on this, we can say that people continue to spend additional units of a specific resource on a wish until their marginal benefit is less than their marginal cost.

every society, in order to meet the needs of it's people, has to answer three basic questions:

- what should we produce?

- how should we produce it?

- for whom should we produce it?

this questions must be answered in order to, option b, aid in production decisions.

every country can't produce everything, no matter how rich their land is. it may be a matter of technology, resources or geographical conditions. so, these three questions must be resolved in order to get the most of the production of each land.

hope this !

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