+1
Should be implemented simply, not too gamey, not too manual. There are right ways and wrong ways. Here's my idea, I thought about it since I like this idea a lot and would make sense for New York City, the home of the NYSE, which may or may not still exist. Perhaps it does, under new management of course. I suspect the Germans would want to take advantage of American Capitalism rather than bring it down.
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I think this is a good way to do it:
You'd have a bunch of NPC companies (Krupp Stahl, Reichsbahn, etc.) whose prices move on their own with some randomness so the market always feels alive, but when players buy or sell it actually pushes the price up or down. Player owned businesses could pay a fee to go public and list their company, and their stock price gets affected by earnings reports they file (which they can fake, giving the State something to investigate). All trading happens physically at terminals inside the stock exchange or at brokerage offices, no menus or HUD stuff (or you CAN use menus/HUD stuff), keeps it in the RP. Brokers would be a flagged role (class, flagged role, there are many ways to do this) that trades on behalf of clients for a commission (or just steals their money). Admins get simple commands to trigger crashes, booms, or scandals tied to server events. Every trade gets logged so insider trading and manipulation are possible but detectable, making them real RP crimes instead of blocked mechanics.
Basically I don't want it to be entirely reliant on Google Docs or entirely reliant on game code. A balance should be struck, and can be!