Libya's US$67 billion sovereign wealth fund will commence proceedings against Goldman Sachs in a London court this week, alleging that the investment bank exploited the fund by encouraging it to make risky and ultimately worthless investments. Reuters reports that the Libyan Investment Authority is claiming US$1.2 billion of losses over nine disputed trades carried out in 2008. The LIA is also taking action against Societe Generale over US$2.1 billion of similar trades. Retailer Walmart Canada will stop accepting Visa cards for payment, citing "unacceptably high" fees, the BBC reports. Walmart and Visa had been negotiating a new fee deal and failed to reach agreement. Walmart has 370 stores in Canada and will start phasing out Visa payments across its network in July, unless agreement is reached before then.