For instance, markets may result in a very wide distribution of income, such that some individuals may receive no income at all. Incomes are earned in a market when individuals sell or hire out their factor of production to others, which include wages, interest, profit and rent. However, these incomes can vary considerably, and some individuals cannot earn even a moderate income. In a free market it may be difficult for some individuals to earn an income at all, leaving them unable to buy goods and services. Those who are likely to receive less than ‘average incomes’ include: the unemployed, the underemployed, the sick and disabled, those with poor qualifications or low skills, the elderly and those working in the unofficial labor market where pay is below the legal minimum.