CEVAP:

We have already stated that investment expenditures are made up of expenditures of firms on capital goods and stocks. Capital goods are the equipment they need to carry out production activities and the buildings that firms have. Stocks are composed of final unsold goods. Stocks may be planned or unplanned. For example, a tire firm
will start to have enough winter tires in stock from the autumn to meet the winter tire demand which is expected to intensify in the winter months. Otherwise, the firm’s inadequate stock operation can lead to a reduction in sales and loss of revenue.
For this reason, the investment made by this firm is a planned inventory investment - that is, a stock change. If the firm wants to keep as few unsold winter tires as possible in its stocks until the month of February, and there are still unsold winter tires
in February when it comes, this is an unplanned inventory investment. Unplanned stock changes can be regarded as a sign showing that sales are not as good as expected and that there is too much production in the previous period.