You sell t-shirts in the street corner in order to support some of your tuition costs. Around the middle of the semester, your friend Carlos gives you the following advice: "if you increase the price of each t-shirt you sell you will be able to make a lot more money selling your t-shirts". For Carlos to be right, the price elasticity of t-shirts must be price:
a) constant
b) elastic
c) unitary
d) inelastic

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