Telling someone thank you is positive reinforcement. As cheesy as it sounds, it reassures people that they are appreciated and that they should continue to do so in the same manner they already have. When people don't receive that recognition, they will slowly start slacking in their efforts because they start to lose sight of why they are doing these things.
Think about those people who have performed the same job year after year without a decent pay increase, a promotion or any other form of a "thank you" for your hard work and dedication. These people probably have regressed in their role instead of progressed because the "thank you" tendencies and qualities don't equate to their efforts.
Say thank you whenever you appreciate something or someone regardless of the effort. It not only builds that positive reinforcement for the other person but it will make your days better as well because you truly appreciate what has been done. There are many ways to say thank you and it's always best to do it naturally and in a way that reflects your appreciation.
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