Wage labour (also wage labor in American English), usually referred to as paid work, paid employment, or paid labour, refers to the socioeconomic relationship between a worker and an employer in which the worker sells their labour power under a formal or informal employment contract. These transactions usually occur in a labour market where wages or salaries are market-determined. In exchange for the money paid as wages (usual for short-term work-contracts) or salaries (in permanent employment contracts), the work product generally becomes the undifferentiated property of the employer. A wage labourer is a person whose primary means of income is from the selling of their labour in this way. Characteristics In modern mixed economies such as those of the OECD countries, it is currently the most common form of work arrangement. Although most labour is organised as per this structure, the wage work arrangements of CEOs, professional employees, and professional contract workers are sometimes conflated with class assignments, so that "wage labour" is considered to apply only to unskilled, semi-skilled or manual labour. Types The most common form of wage labour currently is ordinary direct, or "full-time". This is employment in which a free worker sells their labour for an indeterminate time (from a few years to the entire career of the worker), in return for a money-wage or salary and a continuing relationship with the employer which it does not in general offer contractors or other irregular staff. However, wage labour takes many other forms, and explicit as opposed to implicit (i.e. conditioned by local labour and tax law) contracts are not uncommon. Economic history shows a great variety of ways, in which labour is traded and exchanged. The differences show up in the form of: Employment status – a worker could be employed full-time, part-time, or on a casual basis. They could be employed for example temporarily for a specific project only, or on a permanent basis. Part-time wage labour could combine with part-time self-employment. The worker could be employed also as an apprentice. Civil (legal) status – the worker could for example be a free citizen, an indentured labourer, the subject of forced labour (including some prison or army labour); a worker could be assigned by the political authorities to a task, they could be a semi-slave or a serf bound to the land who is hired out part of the time. So the labour might be