For any activity to be worthwhile, from an economic standpoint,
its costs must be less than its benefits. The greater the benefits
of some activity, the greater the cost one is willing to bear to
undertake that activity. Supply works like this too. As the market
price rises, it becomes worthwhile for firms to take resources
from other activities and put them to work producing more output.
That's a simple version of why the supply curve is upward sloping.
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