The underlying reason for the upward sloping nature of the supply curve is that

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The upward sloping nature of the supply curve is due to the fact that the production of most goods comes with increasing marginal costs. As more units of a good are produced, the cost of producing each additional unit increases. This is due to factors such as diminishing returns to labor and capital and the need to use less efficient production methods to increase output. Therefore, firms require a higher price to produce and supply additional units of a good.

The Underlying Reason for the Upward Sloping Nature of the Supply