By the ETF research team at State Street Global Advisors.Investment-grade credit was the darling of investors in 2020. Dramatically wider spreads to government bonds, following the March sell-off, coupled with a central bank backstop made IG credit an easy investment choice.However, the positive feelings toward the sector had largely played out by the end of the year. Rising US Treasury yields, the end to the Federal Reserve’s buying program, and little room for further spread compression meant that Q1 2021 ...