Confidence votes 20.3K. There are two basic types of submarine screws. (Screw is the proper term here as propeller is applied to small craft.) One of the screws is built for silence, and the other is built for speed. Screws built for speed typically have fewer blades and the blades are wider to grab more water as the screw spins in the water.
Economic Definition of assumption. Defined. Term assumption Definition: An initial condition or statement that sets the stage for an analysis by abstracting from the real world. Assumptions are important to economic theories and economic analysis. Some assumptions are used to simplify a complex analysis into more easily manageable parts.
Independent Economic Actors. In business microeconomic theory, the choices made by each individual economic actor are assumed to be independent of other choices made by every other economic actor in the marketplace. Female economic decisions are presumed to be made in a highly dependent, inter-linked and of course subordinate web of contingencies.