Scottish students get "free tuition" at Scottish universities which means undergraduates do not have to pay fees for their courses if they can secure one of the limited number of places.
However, universities have long claimed that the money it receives from the Scottish government has not kept pace with inflation and is less per student than similar institutions in England get from tuition fees.
Scottish universities, like most in the UK, have been on a recruitment drive to draw in students from other parts of the world, charging them much higher fees than UK students – from about £10,000 up to £40,000 per year.
For those with a prestigious reputation, including Scotland's older universities, the share of foreign students has risen to close to 40%.
This has brought controversy - about the quality of learning, standards of English language ability, and the surge in demand for student accommodation.
It has also brought vulnerability if the demand for places falls away.
A growing concern about universities, including Glasgow and Edinburgh, becoming too dependent on Chinese students saw recruitment shift to other countries.
Nigeria was one new target, encouraged by the UK government.
But the market there depends on the strength of the Nigerian currency, which fell sharply and cut off the number of people who could afford to come to the UK.
Other factors, such as tighter visa restrictions and stronger competition from other countries, have led to further falls.