Existing literature has documented a lot of research efforts on the issues of corporate diversification discount and diversification premium, most of them trying to explain the rationales why firms diversify or focus, especially to unveil the benefits and costs of their diversification...

Human capital raises rural incomes, but this effect is swamped by higher returns to human capital in urban markets. This leads to 'brain drain' from rural areas. Populations grow more rapidly in rural counties that have a diversified employment base. Farm population grows faster (or declines...