有关GDP的問题

GDP = C + I + G + (X-M)

A house consumer and A restaurant buying a pound of bread, The GDP of them, should be A restaurant occured a higher GDP.
Because A restaurant selling the bread to other consumers will occur extra consumption.
If we counted GDP under expenditure, the sum of consumption (C) betweet them is difference.

A house consumer caused consumption is $0.
A restaurant caused consumption is "their selling price" (more than $0).
Therefore A restaurant buying a pound of bread will occur a higher GDP.