The case was in the late 90s. I, a very young, if not to say more, a boy, replaced our employee at the social exhibition of the government of Moscow. There were earlier such events, with the main purpose of the districts of the city to show "what we could" and also for informal contacts between officials, since visitors to such an exhibition had little interesting.
My job was to sell professional literature. It took three hours for the staff to resolve their urgent questions. The trade went smoothly - as the low-level officials, which formed the basis of the contingent, were very wealthy in those years. However, the usual theft at the time was not noticed, and this somewhat reassured. Until the end of my watch (and this was my first experience at a public event) there were 15 minutes left. Then a woman came into the shelf. She looked at the books very carefully and chose a thick and very rare reference book on medicine. I began to list him. Then I clarified the price. Then she began to list the directory again, praising the content. After a couple or three minutes, she sadly put the guide on the spot and wanted to leave.
Did not come? I asked surprised.
On the contrary, I need him very much. It is expensive, I don’t have so much.
I do not set prices, unfortunately, I cannot help. Are you interested in medicine?
I am Doctor. Emergency ambulance in the Riyadh region. Here on a trip. We are paying the salary and nothing is missing. And I have already bought one book on medicine, the second I will not pull, food is not enough otherwise.
I looked at this woman, her sad eyes, and began to understand something inside my soul.
Are you upgrading education? Do you want to graduate later?
Yes is no. We are in a very difficult situation with medicines. Sometimes you prescribe something to the patient - and take it from nowhere. at all. There is no money in man. And you cannot help him. Here I am looking for referrals, where there are some alternative options for treatment, from false remedies, what we can get cheaper.
I kept silent, then took the book and gave it to a woman.
Here is, take it. No need for money. I will give her to you.
- Boy, but she is accountable, you are fined!
I will agree. You need her more than I need my money now. Take it. Good luck to your patients.

P.S The way she said to me, “Thank you!“I remembered it all my life. It is the highest human gratitude that one can only dream of.

( Referred to https://www.anekdot.ru/an/an1407/o140705;100.html#8)