Basic economics question?

Does supply slope upwards for the same reason demand slopes downward? By that I mean, as price increases, more and more producers decide it's worth it to join the industry and start selling, increasing the quantity supplied. Or is it because of marginal cost increasing, and they need more money to make more ... show more Does supply slope upwards for the same reason demand slopes downward? By that I mean, as price increases, more and more producers decide it's worth it to join the industry and start selling, increasing the quantity supplied.

Or is it because of marginal cost increasing, and they need more money to make more products.
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