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The correct sequence of spectral type letters from hot on the left to cool on the right is
Pollution
The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
External Benefit
A positive effect experienced by unrelated third parties resulting from a transaction or activity.
Subsidizing
The act of a government or organization providing financial support to reduce the cost of goods or services, often to encourage production or consumption.
External Benefit
A benefit that affects parties other than the buyers or sellers involved in a transaction, similar to a positive externality.
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