Included, or excluded, from GDP?

Question

are these either included, or excluded, from GDP? Explain briefly.

- The purchase of a used tractor by a farmer.

- An increase in goods stored at a company’s warehouse.

- Government purchases of missiles.

- Social security checks received by a retired person.

Answer 1

the first and the last should not be included in GDP.

Answer 2

Following are not included in GDP:

- The purchase of a used tractor by a farmer.

- Social security checks received by a retired person.