The _________________ means knowing how the national income or the total income arising from what has been produced in the country is distributed through wages (and salaries), profits and interest.

study of distribution

 The correct answer is Option 3: Study of Distribution

Economics is often discussed in three parts: consumption, production and distribution.

We want to know how the consumer decides, given his income and many alternative goods to choose from, what to buy when he knows the prices. This is the study of Consumption.

We also want to know how the producer, similarly, chooses what and how to produce for the market. This is the study of Production.

Finally, we want to know how the national income or the total income arising from what has been produced in the country (called the Gross Domestic Product or GDP) is distributed through wages (and salaries), profits and interest (We will leave aside here income from international trade and investment). This is the study of Distribution.