Here in the Netherlands pocket change seems to be a very important part of day-to-day life (especially at the supermarket!). We can hardly pay for anything in cash without being asked if we have the exact change. I'm not sure if there's a shortage of change or it's just what people are used to, but each to their own.
After seconds of intense research one morning I determined the optimum amount of change to put in my pocket and I felt a discovery of this nature must be shared with the world!
The smallest coin that generally gets used here now is the 5 cent coin, so it's important to have one of those, also 2 x 10c, 1 x 20c, 1 x 50c, 2 x €1, 1 x €2. And for the notes preferably 1 x €5, 2 x €10, 1 x €20 and a €50.
"Why?", I hear you roll your eyes and ask? Well this enables you to produce any combination from €0.05 to €99.95, with 5c increments :)