For (a + b)(a – b), remove corner square b² from square a²; rearrange the remaining L-shape into rectangle (a + b) by (a – b). For (a + b + c)², divide a square into 9 blocks yielding a² ...
Category: Class 9 Social Science
NCERT Solutions for Class 9 Social Science and important questions for 2020-2021.
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Understanding opportunity cost forces decision-makers to evaluate the forgone alternative value before spending resources. It prevents reckless waste, maximizes overall utility and ensures limited time and capital deliver the greatest potential return.
The correct choice is (b) Opportunity cost. Selecting one option requires giving up the benefit of the other alternative, which precisely defines opportunity cost when managing limited financial resources against competing desires.
Pure market systems cause monopolies, extreme inequality and neglect public welfare, while pure planned systems stifle entrepreneurship, efficiency and individual freedom. A mixed economy balances market-driven growth with government social welfare safeguards.
A market economy grants the most individual freedom and drives innovation best. Intense private enterprise competition, unrestricted consumer choice and the search for profits incentivize firms to invent superior technologies and products.