Answer:
GDP is not affected
Explanation:
Provided that,
Scott charges $125 for an hour for his time for manufacturing custom made wood products.
As he prepares a gift for his wife, he spends 15 hours on such preparation.
If such time was used by him in his commercial activities then he would have generated revenue of $125
15 = $1,875. Further the amount is just related to a single individual, where as economy relates to entire country.
Now, when we talk about economy this amount of $1,875 for a country like US will not affect at any material level to the GDP. As this amount is so immaterial, there will be no impact on GDP.
Thus GDP will not be affected.