I think the answer is increase an increase in demand for the stocks of similar companies. If all similar stocks would increase, the effect would also increase the stock price of a company. This is could be in consideration of sudden changes of factors in the market that gave basis for price increases. This might have created a standard of near prices for similar stocks.
According to different estimates, between 65,000 and 120,000 sub-Saharan Africans enter the Maghreb (Mauritania, Morocco, Tunisia, Algeria, and Libya) yearly, of which 70 to 80 percent are believed to migrate through Libya and 20 to 30 percent through Algeria and Morocco. Several tens of thousands (not hundreds of thousands, as media coverage might suggest) of sub-Saharan Africans try to cross the Mediterranean each year.