A U.S.based Canadian David Card, Israeli-American Joshua Angrist and Dutch-American Guido Imbens today won the Nobel Economics Prize for insights into the labour market and "natural experiments". <br />''        <br />''The Nobel committee said in a statement that the researchers were honoured for providing "new insights about the labour market" and showing "what conclusions about cause and effect can be drawn from natural experiments". <br />''<br />''Half of the prize went to Card, a professor at the University of California, Berkeley "for his empirical contributions to labour economics." Card's work has focused on labour market effects of minimum wages, immigration and education. <br />''<br />''The other half went jointly to Angrist, a professor at the Massachusetts Institute of Technology (MIT), and Imbens, a professor at Stanford, "for their methodological contributions to the analysis of causal relationship.