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Retail trade
A checkbox has been added to the retail panel to automatically transfer coins to a deposit account if the player has more than 750 (disabled by default).

Right click on a resource "for sale" in the trade dialog transfers 100 units to the retail panel (Shift - 500). Right click on a resource "for buy" returns it back.

Every 5 seconds a random part of every resource on the panel is sold for coins at a 2.25x bonus over the market price.

Coins on the panel become a deposit. Every 5 seconds the deposit gives 0.125% interest.

The coin statistics panel shows the expected retail and deposit income per second. Real sales are random, so the actual income differs from second to second.
