it is the retail value of the good less the value of raw materials produced in the prior period (16.50 – 3.50 = 13.00).

问题如下：

Question

The costs associated with the production and sale of a good are indicated in the following table:

The contribution (in £/unit) that this good makes to current GDP is closest to:

选项：

A.13.00. B.16.50. C.24.67.

解释：

Solution

A is correct. GDP is defined as the market value of all final goods and services produced within the economy in a given period of time. In this case, it is the retail value of the good less the value of raw materials produced in the prior period (16.50 – 3.50 = 13.00).

As indicated in the preceding table, GDP can also be determined either (1) by the difference between the sum of the selling prices at each stage of the process in the current period less the total costs of the inputs at each stage of the process arising in the current period (41.17 – 28.17 = 13.00) or (2) by summing the value added at each stage of the process in the current period (1.92 + 2.60 + 3.21 + 5.27 = 13.00).

B is incorrect: £16.50 is the selling price of the final good. Since the input materials were produced in the prior period, their cost needs to be deducted from the selling price (16.50 – 3.50 = 13.00) to determine the current contribution to GDP.

C is incorrect: £24.67 is the sum of all the input costs incurred in the current period (28.17 – 3.50 = 24.67).