Monetary expression of gratitude, the tip is a practically universal 'payment formula', with the exception of countries such as Japan, where it is considered a rude detail, or China, where it is somewhat offensive. The same happens with the will, with the difference that in this case the person who must collect is exposed to the fact that the client has very little will or that it is null, which is usually solved with an aid: 'Excuse me, I have nothing loose…'.

Leaving aside Mr. Rosa, the character played by Steve Buscemi in 'Reservoir dogs', we have all once asked ourselves the big question: do we tip? And if we leave it, what is the correct number? Because of course, you can be too generous or too stingy. Mr. Rosa knew very well what was being done: 'I have it very clear, that they learn to type', he stated at the beginning of the film about the waitresses in a cafeteria so as not to tip them.
Curiously, this scene took place in the United States, a country where it is almost an inviolable religion, to the point that an exaggerated Andalusian would say that there should be a tip to even breathe: at the hotel bellboys a dollar at least, taxi drivers a 15% of the race… And no matter how much the film director Quentin Tarantino painted it for us differently, with the waiters the thing is complicated since it is necessary to give them between 15 and 20% of the total invoice. And that it does not cross your mind to leave without leaving it, because the waiters will go off looking offended to ask if the treatment received has seemed bad or even with worse intentions ... 
From the etymological point of view, the word tip comes from the Latin 'propinare' which means 'to give a drink', or what is the same, to give someone a drink. For its part, the dictionary of the RAE defines tip as 'entertainment that is given more than the agreed price and as a sign of our gratitude'. 
In other words, it is a sign of gratitude for a job well done and at no time does it lower either the one who gives it or the one who receives it - as long as it is not a laughable figure. 
In fact, if you have not received good service, why should you tip? Legally no one is obliged to give it, but it is considered polite to leave it; that is, we are socially obligated to do so. Also, if it is a courtesy to the one who gives it, the recipient receives an important part of their monthly income. 
The tip is based on an unwritten law: it is given to the right person, at the right time and in the right amount, according to experts in good manners who have ventured to speculate in this territory of 'quicksand'. Much more practical are the inhabitants of Morocco, for whom tipping is almost a national sport since they even ask for it to give you the time. In the Middle East, except in Yemen and Oman, the term most often heard by a tourist is 'baksheesh' which, as you may have guessed, means tip. And what about Cubans, whose overflowing imagination has allowed it to reign throughout the island. After the triumph of the revolution, Castro called it an "insult", something that led his compatriots "owners" of bars to change the label of their boats, which started to have the word insult written. 
Although there are multiple indications that the custom of giving additional money was already common in ancient Rome, various historians date the modern origin of the tip, as we know it (and suffer) today. In seventeenth-century England where pub owners began placing a can on the counter where customers left a coin for employees. It is believed that the root of the English word, 'tip', has to do with the sound that said coin made when hitting the can. 
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I am a dreamer and in my dreams I believe that a better world is possible, that no one knows more than anyone, we all learn from everyone. I love gastronomy, numbers, teaching and sharing all the little I know, because by sharing I also learn. "Let's all go together from foundation to success"
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