WSJ: Berlin’s push for a Tobin tax is good news for London. No word, yet, on the actual tax rate, though the European Commission’s proposal of 0.1% on equity and bond transactions and 0.01% on derivatives seems to be the widely agreed benchmark. Good luck with that. Germany’s position as Europe’s No. 2 financial center isn’t a birthright—something party leaders ought to keep in mind when they meet next week to try to seal the deal. Financial firms won’t wait for an election to pass to say “Auf Wiedersehen, Frankfurt” and “Hello, London.”