Spry make a number of points against these ideas, but one of the most important is
Finally, politicians erroneously claim that construction spending for these sports facilities will create jobs for Minnesotans. These claims ignore the basic economic concept of opportunity cost. Instead of building duplicative facilities, we could have either more productive public spending, such as improved courts or roads, or reduced taxes on private-sector investments.Thinking about the opportunity cost of such proposals is important in any situation but it is doubly important for cities like Christchurch were there is so much that needs to be done.
(HT: The Sports Economist)