The muskrat is found in wetlands over a wide range of climates and habitats. It has important effects on the ecology of wetlands and is a resource of food and fur for humans.The muskrat is the largest species in the subfamily Arvicolinae, which includes 142 other species of rodents, mostly voles and lemmings.Muskrats are referred to as  rats  in a general sense because they are medium-sized rodents with an adaptable lifestyle and an omnivorous diet.he muskrat is found in wetlands over a wide range of climates and habitats. It has important effects on the ecology of wetlands and is a resource of food and fur for humans. The muskrat is the largest species in the subfamily Arvicolinae, which includes 142 other species of rodents, mostly voles and lemmings.
1 KRS College of Management Studies, Nasik. 2  An economic model is a mathematical or logical statement of economic theory. 3  It is a method of analysis which presents an over-simplication of the real world. 4  Economic Models can set up with diagrams, words, equation form, etc.
One of the main basic models taught in economics is the circular-flow model, which describes the flow of money and products throughout the economy in a very simplified way. The model represents all of the actors in an economy as either households or firms (companies), and it divides markets into two categories: 1  markets for goods and services. 2  markets for factors of production (factor markets)