Earlier quoted context omitted.
The Euro losing 10% of value in relation to what? USD? Yen? And even if the dollar loses 10% of the value vs every other currency, it's not true that you can only buy 90 beans, because you're not the only one with dollars: there are farmers who sell in dollars, and buy their stuff in dollars, and so will probably keep their prices. When everyone you trade with uses the same currency as you, there's no value to be los…
This is not true. Currency depreciation leads to price inflation. That's why your dollars (or euros) buy less things year over year.
And while both depreciations lead to price inflation, an loss of X% in the latter doesn't lead to an increase of the same amount in price inflation, because not all products completely depend on imports from other economic zones.