In their framework, independent contractors retain control over schedule and hours worked, jobs accepted, and performance monitoring. They also can have a major investment in equipment, furnish their own supplies, provide their own insurance, repairs, and other expenses related to their business. They may also perform a unique service that is not in the normal course of business of the employer. This contrasts with employees, who usually work at the schedule required by the employer, and whose performance the employer directly supervises. Independent contractors can also work for multiple firms, and offer their services to the general public. The distinction between independent contractors and employees is not always clear, and continues to evolve. For example, some independent contractors may work for a number of different organizations throughout the year, while others retain independent contractor status although they work for the same organization the entire year. Other companies, for example in the freight transport industry, specify the schedule for the independent contractor, require purchase of vehicles from the company and prohibit work for other companies. In July 2015, the U.S. Department of Labor issued new guidelines on the misclassification of employees as independent contractors. "A worker who is economically dependent on an employer is suffered or permitted to work by the employer. Thus, applying the economic realities test in view of the expansive definition of "employ" under the Act, most workers are employees under the Fair Labor Standards Act." Examples of occupations where independent contractor arrangements are typical: Independent contracting has both benefits and drawbacks to contractors. Firms in the sharing economy such as Uber can gain substantial advantages via the misclassification of employees as independent contractors. The employer of an independent contractor is generally not held vicariously liable for the tortious acts and omissions of the contractor, because the control and supervision found in an employer–employee or principal–agent relationship is lacking. However, vicarious liability will be imposed in some circumstances:  Due to the higher expense of maintaining employees, many employers needing to transition from independent contractors to employees may find the switch difficult. There is a transitional status for employees as an alternative to independent contracting known as being a statutory employee. Statutory employees are less expensive to hire than classic employees because the employer does not have to pay unemployment tax. However, they are more expensive than independent contractors because Social Security and Medicare taxes must be paid on wages. Similarly to independent contractors, statutory employees can deduct their trade or business expenses from their W2 earnings. A growing number of workers do not neatly fit the government's categorizations of independent contractors and statutory employees, and are increasingly being classified as dependent contractors.