For a doctoral student who would like to become a lawyer specializing in legal advice to Western oil companies producing/extracting hydrocarbons (oil & gas) operating in Central Africa (Cameroon, Gabon, Equatorial Guinea, Sao Tome, Cong Brazzaville ): which thesis subject(s) (law, economics, knowledge of oil-producing countries in Central Africa, culture), would be more likely to interest these oil companies that want to develop or establish in this region of Africa?