Thursday Morning Riddle

I’m a noisy toy gun with which maybe you’ve played;
I’m a drink late at night; curb emissions to trade;
I can help you when thinking; a hat that gives shade;
And a limit on salaries possibly paid.

Who am I?

UPDATE: Riddle solved by Asher. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Asher Says:

    Cap

  2. Bill Says:

    CAP is correct. Way to go, Asher!

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