Under a single-payer system, all health costs are paid by the government using tax revenue. This allows countries to control costs, in part, by having the government play a stronger role in negotiating prices for healthcare.

Proponents of universal healthcare say it increases equality in a society and provides more affordable care. Critics say it can increase waiting times to get care or may lower the quality of healthcare.

Countries with universal healthcare include Austria, Belarus, Croatia, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Italy, Latvia, Lithuania, Luxembourg, Macedonia, Malta, Moldova, Norway, Poland, Portugal, Romania, Russia, Serbia, Spain, Sweden, Switzerland, Ukraine, and the United Kingdom.

With notably high healthcare costs, the USA provides government programmes to help the disabled, old people and other vulnerable demographics. Other countries with no free healthcare include Nigeria, Yemen, South Africa, Egypt, Afghanistan, Pakistan, and Iran.