EU membership is too important to gamble.  Membership of the European Union is too valuable to be cast aside. Prime Minister David Cameron refuses to hold a referendum for a good reason: he knows that leaving the EU would inflict great harm on the UK.1Economically, the UK is weaker on trade negotiations, especially with the US,2 as a lone entity. In international society, the country will be seen as unreliable, and the UK's already fractured relationship with Europe will sustain further damage. Keeping strong ties with Europe as well as the US is essential for UK well-being. If the UK left, the EU would be weaker and might collapse. The organization is at a crossroads given the collapsing Euro and it must weather this difficult time in order to prove its sustainability. If it lost the UK's financial support, the economic fallout in Europe would further weaken the continent's economies, which would in turn harm the UK, whose economy would necessarily remain tied to its European trading partners and financial service customers.  1 PHIBBS, HARRY. March 14, 2011. "Is Cameron worried that withdrawal from the EU would be a foregone conclusion if a referendum is agreed?" The Daily Mail., accessed June 20, 2011.  2 BOWLBY, CHRIS. November 16, 2009. "If the UK left the EU what would the consequences be?" The BBC, accessed June 16, 2011.