Cash machines (ATMs) in this country love €50 notes (€50 is about $64 or £40 at current exchange rates). Requests for hundred's of euros are usually dispensed in wads of €50's and though most machines also dispense €20's stocks of this lower denomination run out quickly giving rise to a "please select a multiple of €50" message.
I guess that keeping the bulk of cash in one large denomination simplifes operational logistics but it does not mesh well with my personal spending habits. I tend to use a credit or debit card for most purchases over €20. When I spend actually currency it tends to be of the loose change variety: €1 for a newspaper, €2 for a cup of coffee and so on. I can assure your from personal experience that it is a rare vendor who has the professionalism to keep up their customer friendly smile when proffered a €50 note for a €1 purchase.
The foregoing has led to my becoming an accomplished practitioner of the ATM Bamboozlement game. The aim of the game is as follows:
To Bamboozle an ATM into giving you low denomination notes while still making a total withdrawal which is as close as possible to the amount you require.
A secondary rule is that the total amount must be withdrawn in one transaction. This rule is justified by the need to minimise ATM transaction charges but it is also a vital element in maintaining the challenge of the game.
It all boils down to the amount you choose to withdraw. Clearly a request for €100 or €200 will result in your wallet being filled with hard to spend €50 notes. On the other hand a request for €60 is a good play while €80 is an even better one. Both of these requests are likely to be met with a wad of €20's but also leave the tantalising possibility of getting a €10 note from one of the rare ATMs that still stocks this denomination.
Be careful, ATMs do not always play fair. Yesterday I tried to withdraw €110, thinking this to be a master play. The machine refused to comply responding instead with a request for an amount "that can be dispensed in €10, €20 and €50 notes only". There are many ways to dispense €110 using those denominations and in any case I am sure the reference to €10 notes is bogus as I have never seen this particular machine dispense anything smaller than a twenty. Clearly this message was an attempt to dis-orient me and put me off my game.