Robert Mundell's Optimal Currency Area (OCA) theory, developed in 1961, identifies criteria for when countries benefit from sharing a currency: high labour mobility between members, price and wage flexibility, diversified and similar economic structures, fiscal transfer mechanisms, and synchronised business cycles. Academic analysis of Iceland against these criteria yields mixed results. Iceland's economy is highly specialised (fisheries, aluminium, tourism) and subject to sector-specific shocks not shared by eurozone members, suggesting it is not a natural fit. Labour mobility between Iceland and the eurozone is low due to language barriers (though high within the Nordic labour market). Iceland lacks the fiscal transfer mechanisms that buffer asymmetric shocks in functioning currency unions. However, Iceland's trade is heavily eurozone-oriented (EU accounts for approximately 50% of goods trade), and its business cycle has become more synchronised with the EU since EEA membership. Joseph Stiglitz (Nobel Prize 2001) has repeatedly argued that the eurozone is not an optimal currency area, noting in 'The Euro: How a Common Currency Threatens the Future of Europe' (2016) that without sufficient fiscal transfers and labour mobility, the single currency forces adjustment through unemployment rather than exchange rate depreciation — a particular risk for small peripheral economies.