Luck egalitarian equal opportunity theorists start by distinguishing unchosen circumstances and individual choices. The former are matters imposed on an individual in ways that she could not have influenced or controlled; these matters are just given. It makes no sense to hold the individual responsible for anything that falls in the category of circumstances. Prominent circumstances include the socialization and early environment provided by one's parents or other guardians, one's genetic makeup, and the features of the world in which one finds oneself prior to any opportunity for responsible choice. People face very unequal circumstances, but this inequality, due to unchosen good or bad luck, should be eliminated: People's initial circumstances should be made equal. But once individuals make choices to lead their lives in one or another way starting from initial equality, justice does not demand further compensation if risks taken happen to turn out badly and in fact justice demands that further compensation should not occur. At least this is so if people are making choices under conditions of interaction that are fair and no sheer good or bad luck beyond anyone's power to foresee or control intervenes. “Fair conditions for interaction” may be taken to be an environment in which individuals are free to make deals on mutually agreeable terms and contracts are enforced, individuals are prohibited from deliberately harming each other by physical assault, extortion, coercion, fraud, theft of property and the like. Also, individuals are either prevented from imposing the costs of their activities on others who do not consent to be so involved or they are required to pay appropriate compensation for harm done that is tortious in this way.  Fair conditions of interaction also include an initial equality of circumstances. Different luck egalitarian equality of opportunity theorists propose different conceptions of how to draw the line between circumstances to be equalized and choices for which individuals themselves are properly held responsible. They also propose different conceptions of how to assess circumstances for purposes of distributive justice and how to measure them so that one can determine when one individual's circumstances overall are equal or unequal to another's.