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What are interactions with selection? Give an example and explain why it's a threat to internal validity.
Purely Competitive Firm
A business functioning in an environment with numerous purchasers and vendors, where no single entity has the power to notably affect the prices in the market.
Technological Improvement
Advances and innovations in technology that enhance efficiency, productivity, or capabilities in various sectors.
Product Demand
The amount of a product or service that buyers are ready and capable of buying at different price levels over a specified time frame.
Decreasing-cost Industry
An industry wherein an increase in the scale of production leads to a reduction in the average cost of production.
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