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At About What Age Does Infants' Smiling Indicate Feelings of Happiness

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At about what age does infants' smiling indicate feelings of happiness?


Definitions:

Political Economy

The study of government using the analytic methods of economics.

Economists

Professionals or academics who study the production, distribution, and consumption of goods and services.

Psychology

The scientific study of the human mind, behavior, and processes associated with how people think, feel, and interact with their environment.

Arrow's Impossibility Theorem

A theory in social choice stating that no rank-order voting system can convert the ranked preferences of individuals into a community-wide complete and transitive ranking without violating one of the criteria necessary for a fair vote.

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