In theory, a single currency makes Europe a more efficient, and therefore, better place to invest.

In the long run, they say, maintaining the currency makes economic sense by providing a stable environment for investment, foreign and domestic.

A weaker currency makes foreign imports more expensive for American consumers.

And one currency will make European price comparisons much easier.

A single currency will also make it harder for multinational companies to charge different prices in national markets.

A unified currency makes economic sense, but trade efficiency is only one motive for many governments.

A cheaper currency makes a nation's products less expensive in other countries.

Because the single currency makes all costs easier to compare, countries with higher taxes are likely to lose business.

The single currency of democratic countries will make demands on democracy.

That the single currency has made one necessary is manna from heaven for us.