The endless restructurings and mergers have definitely distracted many companies, and created a big braindrain, butthe underlying intrinsic productivity potential of many of these groups has gone up, not down, from what I can tell.
Africa shouldn't just focus on local problems but needs to aspire to be at the core of global science to stop thebraindrain and make the best of its talent.
Sweden has one of the lowest rates of corporation tax 28% but it suffers from a braindrain because its high income-tax rates tend to drive executives abroad.