While the extra cost of disability varies greatly depending on the availability and financial accessibility of goods and services, researchers have calculated that it can amount to almost 50 per cent of an individual's income. A recent study on older persons with disabilities estimates that, on average, disability costs are approximately 65 per cent higher than the net weekly pre-disability household income. In addition, the economic cost of living with a disability includes foregone benefits or opportunity costs (e.g., lost income of individuals with disabilities or of family members who cannot work, or who work less, if the household includes one or more persons with disabilities), the impact of which depends on many factors, including the type of impairment, the household's socioeconomic status, the individual's work status and the policy context (e.g., the existence of disability benefits).