Civilians are in fact allowed to
shop at the Main Exchange and
MCX Marine Mart, though there are some restrictions. ... All other
civilian employees are only authorized to purchase consumables for one person, meaning single-serving beverages and food items.
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MCX stands for the Multi Commodity Exchange. MCX trading is the exchange for trading commodities; just like how BSE is for trading stocks of companies. You can trade gold, silver and other precious metals along with agricultural commodities like cotton, coffee etc.