 While finance has, over long stretches of history, been rather strictly regulated, there has been a reversed trend towards deregulation since roughly the 1970s. After the financial crisis of 2008, there have been many calls for reregulation. Proposals include higher capital ratios in banks (Admati &amp; Hellwig 2013), a return to the separation of commercial banking from speculative finance, as had been the case, in the US, during the period when the Glass-Steagall Act was in place (Kay 2015), or a financial transaction tax (Wollner 2014). However, given that the financial system is a global system, one controversial question is whether regulatory steps by single countries would have any effect other than capital flight.