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I have a bad habit of not properly utilizing foreign currency coins when I tour any country. When I pay in bills and get back coins I don't know why my brain is programmed to think of them as change and for the next purchase I would again use a new bill.

Sometimes it is also due to the fact that I don't like to spend a long time on a counter trying to count coins up to a certain amount so just to make it easy for me I would just pay with a currency note that's slightly bigger than the required amount, or use a combination etc. It is also due to the fact that sometimes its hard to get used to the denominations specially for coins on a short trip; they sure do some in various shapes and sizes, whereas on for paperback it is comparatively easier.

I usually bring all those coins back home, they are quite a bunch of them by the end of a trip. I bring them home as a memory or as something that relates to my trip for a long time to come. I am not a coin collector but sometimes when I see that this coin that I have is from a country which i visited when i was a child it makes me feel good. Sometimes my family members take some of them as souvenirs.

The only time I use those coins abroad is on vending machines and lately in theme parks for my kid on toys which operate with coins.

Lately I have been reading about this fairly global practice that all coins should either be used at the airport or given to homeless people in that country before you fly out.

That has got me wondering whether what I do is unethical? I am not a miser nor do I have any use for those coins when I reach home but even when I find a homeless person abroad I give them a currency note instead of a coin.

Is this a bad practice?

I don't personally think there are any ethical issues with taking change away. One good reason for doing so is to land with a little change next time you visit; I find it quite handy to have a couple of quarters in my pocket when I land in the US, just in case I need to make a small purchase from a vending machine, or a call from a payphone. Visitors to the UK, where a pound coin is very often used as a return-to-stand deposit on luggage (and shopping) trolleys, would probably find similar utility in a little pocket change.

But if you do feel bad about this, and you ever fly BA, they're still running their Change for Good scheme with UNICEF; you put all your change in the envelope in the seat back, hand it to the cabin crew, and they get it to UNICEF who use it for the great good that they do. No doubt some other airlines have similar programmes, and I've noticed that some banks in the UK, particularly in tourist areas, have charity collecting boxes for foreign coinage.

As a passing note (hah!), I'd mention that in many countries, where the lowest denomination note is still fairly valuable (eg, the smallest note in the UK is worth about USD8), the practice of using notes for everything and disregarding change can get both expensive and heavy quite quickly. One visitor of ours, from the US, bemoaned how expensive things were in the UK. That's not a novel observation for US visitors, but he seemed particularly upset; when we did a bit of digging, we found a pile of change by his bed, with over £120 in it, which he had mentally discarded as "worthless". I don't think he spent anything but coins for the rest of his trip; you may find that a re-examination of your every-transaction's-a-note policy reaps dividends, here.

There is nothing unethical about keeping your own money. The money you earn is your to spend as you see fit (other than what your government demands you give them in taxes ;-).

Lots of travelers keep their leftover coins and currency as souvenirs, as you mentioned, it brings back fond memories.

Lots of travelers bag up their leftover currency and coins to hold on until they next travel back to that country.

Lots of travelers place their coins in donation boxes or UNICEF envelopes, because they like to help others and have other souvenirs to remind their travels.

Fund raisers will do their best to pull at your heart strings in order to get your donation, but you have to evaluate if their cause is something you want to help. You should not feel guilty simply because you didn't donate.

Seigniorage,the difference between the value of money and the cost to produce and distribute it, is usually positive. In the US for example:

╔═════════╦══════╦═════════════╗ 
║ Coin ║ Cost ║ Seigniorage ║ 
╠═════════╬══════╬═════════════╣ 
║ cent ║ 1.7 ║ -0.7 ║ 
║ nickel ║ 8 ║ -3 ║ 
║ dime ║ 3.9 ║ 6.1 ║ 
║ quarter ║ 9 ║ 16 ║ 
╚═════════╩══════╩═════════════╝ 

So if a visitor takes home US quarter, he has effectively donated 16¢ to the US government.

Taking home lots of pennies (as we Americans are wont to call our one-cent pieces, using an American pluralization of the name of a British coin) technically costs the government money, but my opinion about the ethics of this is that if a government wants to play stupid games, nobody should feel bad about awarding it stupid prizes.

The question of ethics is generally centered around conflict of interest. An ethical conflict of interest exists when you have an opportunity to do something that will benefit you personally, but will cause problems for a different obligation that exists for you in this context. (For example, a stockbroker who recommends a stock that will earn him a nice commission, but isn't likely to actually benefit the client who purchases it, is behaving unethically by choosing to benefit his own interest at the expense of his professional responsibility to his client.)

If you have an interest in taking money out of a country, but no professional or moral interest in having to leave it there, there's no reason why this should be unethical. However, in some specific cases, depending on the countries involved, doing so could be illegal or subject to legal restrictions, and you definitely have an interest in obeying the law, and an obligation to do so. But in the general case, no, there's no ethical problem with this.