How does scarcity, opportunity cost, and choices relate to each other in economics​

Economics is a social science that examines how people choose among the alternatives available to them. Scarcity implies that we must give up one alternative in selecting another. ... The opportunity cost of any choice is the value of the best alternative that had to be forgone in making that choice.

a progressive tax is a tax that imposes a lower tax rate on low-income earners compared to those with a higher income, making it based on the taxpayer's ability to pay. that means it takes a bigger percentage from high income earners than it does from low income people.

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