 However in July 1965, Malaysian Finance Minister Tan Siew Sin proposed raising the contribution to 60% and hinted 'that unless Singapore agrees to pay more, the common market would be slow in coming about'.This was refused by Singapore's Finance Minister, Dr Goh Keng Swee, who accused Kuala Lumpur of imposing tariffs on Singapore-made products.Both sides also disagreed over the issuance of the loan, but agreed to refer this issue to the World Bank for arbitration.