The study of human geography is an important aspect of your GCSE studies. The migration of populations from rural communities to urban centres and vice-versa has an impact on the economy of a country. Some of these impacts are positive whilst others are negative. You will be expected to know some examples of both sides. In general, MEDCs are better placed to manage these changes in a sustainable way.
Looking first at migration from urban areas to rural areas. This happens very little in LEDCs, however, in MEDCs, there are several push and pull factors. Firstly, there are those people who are still working. There are many factors that influence their decision - for example, more peaceful surroundings when they are not at work, cheaper housing with larger gardens, wanting to bring up their family in a rural environment.