Gold

Gold is primarily used to buy units. The easiest way to earn this particular resource is by burgling buildings on the map. It can also be earned by infiltrating certain Businesses that will provide you with Gold bonuses every turn. Lastly, you can kill for Gold, as every slain enemy unit will drop money after their death. More advanced units can be very pricey, so it's crucial to balance the money you spend on muscle and utility against the money you earn doing dirt.