|Rubber is a raw material that gives bonus to weapon and weapon raw material companies.
Rubber is one of the 5 resources that gives bonus to weapon and weapon raw material companies. If linked to the capital, it provides 30% bonus, and if it's not linked to the capital it provides 15% bonus. Even if a country owns more than one rubber resource the productivity increase will be limited to 30%.
|Food raw materials||Cattle • Deer • Fish • Fruits • Grain|
|Weapon raw materials||Aluminum • Iron • Oil • Rubber • Saltpeter|
|House raw materials||Clay • Granite • Limestone • Sand • Wood|
|Aircraft raw materials||Cobalt • Magnesium • Neodymium • Titanium • Wolfram|