The migration is driven by demographics and economics. Larger and larger cohorts are coming of age in Africa, and they have few economic opportunities – in west Africa, except 2–3 countries, most economies are poorly managed. The largest economy in Africa, Nigeria, is not faring well at all. Many if not most migrants from Africa are somewhat educated young people who have no possibilities of getting work that they are qualified for. When Europe was at the same demographic transition the response was a massive migration to the America. But this is less feasible for Africans. But we see that African immigrants to America are doing well, and much better than non-immigrant black Americans on average.

There would be legitimate reasons to decrease a person’s salary for various infractions or performance issues, if you are contractually and legally allowed to do it. But if they are continually shortening their work week and subsequently aren’t getting their jobs done effectively, you may want to simply terminate them. Just don’t use it as a way to take advantage of employees who may work shorter hours one week to make up for other weeks with longer hours. You may save a few bucks, but you will lose the confidence of your salaried employees. Those who really put in the time to get the work done will see it as a betrayal.