On this edition of Wall Street Week, Lawrence H. Summers, Former US Treasury Secretary and Wall Street Week contributor says that tariffs should be applied with greater discrimination. Sonal Desai, Franklin Templeton Fixed Income CIO says that the Fed should welcome a slightly cooling US economy. Glenn Hubbard, Columbia Business School Professor of Finance and Economics and Former Council of Economic Advisers Chair proposes a new economic model and Ian Bremmer, Eurasia Group Founder and President talks about Russia's growing influence in West Africa.