If you increase the production of buttons from 200 to 300, you need to reduce the production of pins from 200 to 100. That is, increasing the production of buttons by 100 units requires reducing pins by 100 units.
And according to the law of increasing opportunity costs: in order to get more of one type of good in a given time period, society must sacrifice an ever-increasing amount of another good:
"opportunity cost=\\frac{200-100}{300-200}=\\frac{100}{100}=1"
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