Effective factor endowment isGroup of answer choicesthe amount of factor available in a given countrythe amount of factor available in a given country multiplied by the productivity of this factorthe productivity of a factor in a given countrythe amount of factor actually employed in production

The correct answer is: the amount of factor available in a given country multiplied by the productivity of this factor.

Step 1: Understanding the Concept Effective factor endowment refers to the total ability of a factor of production in a given country. It's not just about the quantity of the factor, but also how effectively it can be used.

Step 2: Identifying the Correct Answer The effective factor endowment is the amount of factor available in a given country multiplied by the productivity of this factor. This means it takes into account both the quantity of the factor and how productively it can be used. The other options only consider one aspect (either the quantity or the productivity), but not both.

The correct answer is: the amount of factor available in a given country multiplied by the productivity of this factor.

Step 1: Understanding the Options Each of the options provided refers to different aspects of factor endowment.

Step 2: Identifying the Correct Answer The term "effective factor endowment" refers not just to the amount of a factor available in a country, but also how productively this factor can be used. Therefore, the correct answer is the one that combines these two aspects: the amount of factor available in a given country multiplied by the productivity of this factor.

Step 3: Explaining the Answer This answer is correct because it takes into account both the quantity and quality (or productivity) of the factor. A country may have a large amount of a factor, but if it is not used productively, the effective factor endowment is lower. Conversely, a country may have a small amount of a factor, but if it is used very productively, the effective factor endowment is higher.