I summated a new theory, and if true, we will likely see a 40% premium again...
Lets say there are about the same number of investors/traders of all ranks on both sides of the pond interested in Bank of Ireland. The supply of ADR shares is known to be 40 times smaller here in the US than in Europe. If the share demand is equal (in $$) but the supply is not, a premium for the shorter supply will naturally emerge.
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