Niagara businesses eager to welcome U.S. visitors back as border reopens after more than a year Off and on shutdowns due to the COVID-19 pandemic last summer particularly hurt Niagara businesses since many follow what Diodati calls the ’80/20′ rule, in which 80 per cent of their money is made in 20 per cent of the year.However, on Monday businesses welcomed back American visitors for the first time in more than a year as restrictions at the border eased.