J.D. Vance was largely unknown in American politics until Donald Trump picked him as his running-mate for vice-president. Last night he gave his first speech to the Republican National Convention. Why is trade so sluggish within Latin America (11:34)? And forget management books: literature offers the best lessons in leadership (20:14). Listen to what matters most, from global politics and business to science and technology—Subscribe to Economist Podcasts+For more information about how to access Economist Podcasts+, please visit our FAQs page or watch our video explaining how to link your account.