You have explained some repressed awkwardness for me, not knowing how to respond in those rare cases I deservce thanks. Firstly, I would like to thank you for that. I wanted to point out that you describe "you're welcome" to mean "that they were welcome to your assistance" and that that they are welcome in the sense of a greeting. Being welcome to one's assistance says that you are willing to assist again - as a welcome guest is invited to feel entitled to have his needs met. It releases the recipient of your assistance from returning the assistance, since you are willing to provide more. The very positive implication is that your relation is above the effort to assist, which builds bonds. I think the implication is too subtle, however, and should be followed up with, "Let me know if you need more," or something more specific to how you can help. The Huffington Post has an article (https://www.huffingtonpost.com/adam-grant/pay-it-forward_b_4270340.html) that promotes captilizing on the situation with "I know you would do the same for me," but I prefer building bonds to making obligations.
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