 First, “having a say” is not clear. Does it require having a vote in collective decision-making? Or is it also satisfied by a person’s being able to modify another’s action by negotiating with them, as we see when there is bargaining over an externality? This latter version would undermine the idea that the all-affected principle has direct implications for the boundary problem. When the United States permits activities that produce acid rain in Canada, Canada can negotiate with the United States to lessen the production of acid rain and/or to compensate Canada for the harm. As long as there is a fair and effective system of negotiation, this would seem to satisfy the all-affected principle without giving Canadians a vote in American politics or Americans a vote in Canadian politics.