The turnover of the clubs in the North American basketball league NBA decreased by about 7.2 billion dollars last season due to the coronavirus.
That is about 10 percent of the total turnover.
The clubs missed 700 million dollars in ticket sales because many matches were played without fans.
Television channel ESPN also knows that income from sponsorship and the sale of fan articles has lagged by more than 350 million dollars.
Should the new season start without fans again just before Christmas, clubs expect 40 percent less income.