All of the following are economic indicators except
a: income taxes
b: the gdp
c: retail sales
d: the stock market

The correct option is C, RETAIL SALES.
The income taxes, the GDP and the stock market can be used to gauge the economic status of a particular country, they are economic tools which are used to monitor the economy. 
Retail sales refers to the activity of using cash register to monitor the financial transactions that are happening in a company, this is not an indication for what is happening in an economy.

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