Bellwether often indicates a company that signals the state of the economy or an industry. The quarterly sales of the bellwether are used to predict retail trends.
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Political Predictions
In political discussions, 'bellwether' predicts trends in elections or policies. Bellwether regions can help forecast the outcome of national elections.
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Cultural Change
'Bellwether' is used when identifying things that shape cultural shifts. Popular bloggers can act as bellwethers for emerging fashion trends.