A friend of mine went shopping in Caracas. He was looking for some discount in the small poultry case of the local supermarket and while sifting through things he discovered, between a few chicken legs, an improvised ad:
"Maths specialist. Home lessons. Guaranteed comprehension and success.
Any day. Any time (Name and mobile number)"
Let's go to the chicken wings, though: the price is 1070 Bs a kilo. Instead of translating that into euros or dollars - very few Venezuelans earn either of them -, I'll translate that into a university professor's salary: that is equivalent to 1/19 to 1/39 of what she or he earns in a month. A school teacher earns less, of course.
Mind: you need more than a professor's full monthly salary to be able to rent a tiny flat in a working class area in any major city of Venezuela now.
My parents were a teacher and a professor in public - i.e. free- institutions before Chávez came to power and their salaries gave them a purchasing power that was much higher than anything teachers have in Venezuela of the "XXI Century Socialism".
I forgot to mention: my friend is also a professor. He was one of the very best at university. He would easily have a top job in Europe or in the USA. In Venezuela, though, he has to give maths lessons after his normal work at university in order to buy discount chicken wings.