How all decisions involve trade-offs???

Question

like three examples that will illustrate it

Answer 1

When an economic decision is made, there is always opportunity cost involved. Opportunity cost is the second best alternative forgone when an economic decision is made. The best way to show this is through a PPC (Production Possibility Curve)

For example, you have 2 dollars. You either buy 2 pens or 1 eraser. Of course the pen costs 1 dollar each. And the eraser costs 2 dollars each.  So, you decided to buy 2 pens instead of the eraser (trade off). And the eraser that you didn't buy is your opportunity cost for the two pens.