Sketch a continuous curve y = f(x) for x > 0 if 
= 0, and f '(x) = 
for all x > 0. Is the curve concave up or concave down? 
Definitions:
Free Rider
A person who receives the benefit of a good but avoids paying for it
Free-Rider
An individual who benefits from resources, goods, or services without paying for the cost of the benefit.
Market Forces
The economic factors affecting the price, demand, and availability of goods and services in a free market, primarily driven by supply and demand.
Free of Charge
A situation or service where no payment is required to obtain a good or service.
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