JUST a few decades ago, an asset manager wanting to trade shares, bonds or derivatives almost always had to call up the trading desk at a big investment bank. Today shares and many derivatives can be traded with a few simple clicks (or even in fully automated fashion, using algorithms). But buying and selling bonds, especially corporate bonds, is still an old-fashioned business. Over four-fifths of trading in American corporate bonds still takes place with a dealer, usually over the phone. Yet digitisation is at last beginning to change the structure of bond markets: witness the announcement on April 11th by Tradeweb, an electronic-trading platform, that it is to offer "all-to-all" trading in European corporate bonds, ie, a system in which any market participant can trade with any other.
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