Shopify President Harley Finkelstein discusses how the pandemic impacted his business.  The president of one business has his sights focused firmly on big success for small businesses in America — and his firm has a lot to do with it.  Harley Finkelstein, who runs Shopify, told FOX Business in an interview this week, “It’s quite clear, especially post-pandemic, that small businesses are the backbone of the entire economy. They’re very, very important.” In the past few years, Finkelstein, who is based in Canada, said that the United States and indeed the world has seen that “the only constant in commerce is change — and that things are just happening so…