Amazon expects to incur $4 billion in COVID-related costs next quarter, an estimate that provides a bellwether for other businesses, large and small, trying to stay operational and control expenses amid the pandemic. The upshot: Amazon is planning for COVID to remain an unwelcome companion through the end of the year with costs higher than the previous quarter. The company said Thursday in its third-quarter earnings call that it logged $7.5 billion in COVID-related costs since the disease took root earlier this year.