Basic Trope: Real time strategy games usually have different kinds of resources which have to be gathered to construct buildings and combat units.
Straight: You have to gather resources to build something.
Exaggerated: You have to spend resources for even the smallest action like giving a command to a unit or scrolling the screen.
Downplayed: Once the requisite buildings (mines, refineries, power plants, etc.) are established, the resources collect themselves at a fixed rate and act more like limits on how much can be spent at a certain time.
The game takes place in a scenario with a very complicated barter economy system. The price to buy a battle tank is indeed five tons of lumber, three tons of wheat and a half ton of gold.
The game takes place in a scenario with a very simple construction system. The construction materials for a battle tank are indeed five tons of lumber, three tons of wheat, and a half ton of gold.
Inverted: The game simulates recycling of used military hardware. The goal is to gather raw materials by disassembling tanks and other weapons of war.
Subverted: There are a lot of resources to collect but they aren't important at all to win the game.
Parodied: The resources you need to gather to recruit soldiers are beer and porn. Research is based on how much Cake and internet acess you give your pet Mad Scientist.
Zig Zagged: Only some units and buildings are bought with collected resources; others are acquired with a different system, e.g. by waiting until the factory that makes them "recharges power", or by killing enemies to gain "Victory Tokens" which automatically turn into units/buildings you seem to need at this point.
Averted: There are no resources in the game. Units and buildings can be built for free making time the only resource. Or there is no way to produce anything and you have to work with the stuff you are given at the beginning of each mission and what you lack must be acquired by completing side missions (ie: rescuing prisoners to gain more soldiers).
Conversed: "Sigh. It'll take at least half an hour before I can collect enough vespene gas to build this required unit. When the developers promised 'hours of gameplay', they meant it."
Deconstructed: To build a tank you need about twenty different kinds of raw materials which are processed by different factory buildings into different intermediate goods which are then used to construct hundreds of different mechanical and electronic components. The tank assembly factory is the last one in a very long production chain.
Reconstructed: The game is in fact an economy simulation where you manage an arms manufacturing company. Optimizing the convoluted production processes is one of the most interesting aspects of the game. The actual warfare is just a very minor aspect of the game or even completely absent, set to be released in a "Weapons Test Expansion Pack, coming 20XX" .
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