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The best way to find out if a company values your work enough to offer you a raise is to interview for other jobs, get an offer and hand in your notice. They'll soon offer you an increase if they want you to stay. It puts you in a strong negotiating position too.

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If you hand in your notice, you might as well leave.

Managers are people too and can get really grumpy at your 'oneuppance'. They may give you a raise just to fire you a few months forward, making you lose your currently better offer (If you handed a notice, that was actually what you transmitted - "I want out").

Happens a lot more than one might expect.

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