Hopefully a factor will be increased awareness on the part of players that MONEY IS AN IOU and that as a player of a given game or, within a game, as a citizen of a given civilisation that issues a currency, the currency is an IOU owed by, among many others, that player.
The hope here is that the players will realise that they themselves are in effect the debtors who owe the holders of those IOUs some kind of "redemption" or "honouring" of those IOUs, and thus instead of trying to sell off the currency they will have as a major objective the obtaining of that currency for the purpose of "keeping it off the market".
In the
Galactic Milieu for example most of the most-successful civilisations recognised long long long ago the damage that the type of "griefer" know as a "dumper" can do to their currency and thus instituted various measures to ameliorate such damage and/or suppress or prevent it.
For example, recognise that so called "spot markets" tend to be the places where such griefers ("dumpers") tend to go to do their damage...
For members ("citizens"?) of civilisations this tends to mean that so called "spot markets" can be a great place to BUY their civilisation's currency (and, in fact, also the currencies of any other civilisations plagued by such "griefers"), but poor places to SELL such currencies.
This fact has naturally led to private markets, open to members / citizens / whatever only, becoming one of the "perks" various groups such as civilisations, guilds, clans and so on can offer to their members / participants.
Fortunately or unfortunately, possibly depending upon whether you happen to be or not to be an actual player or a mere non-playing "investor" dabbling in the various currencies of the game, these "griefers" known as "dumpers" have in effect contributed to the distinction between "actual players" and "mere investors"...
-MarkM-