The small but dynamic domestic private sector also produced some lucrative opportunities.[1] Private, part-time schools, which appeared in large numbers in the mid-1980s, offered moonlighting work to university professors, who could double or triple their modest incomes if they were from prestigious institutions and taught desirable subjects, such as English, Japanese, or electronics.[1] Small-scale entrepreneurs could earn considerably more in the free markets than the average income.[1] Business people who served as a liaison between foreign firms and the domestic economy could earn incomes many times higher than those of the best-paid employees of state-owned units.[1] A handful of millionaire businessmen could be found in the biggest cities.[1] These people had owned firms before 1949, cooperated with the government in the 1950s in return for stock in their firms, and then lost their incomes in the political turmoil of the Cultural Revolution.[1] In the late 1970s and early 1980s, when these businessmen were politically rehabilitated, their incomes were returned with the accrued interest, and some suddenly found themselves quite wealthy.[1] Although the number of people earning incomes far beyond the normal wage scale was tiny relative to the population, they were important symbols of the rewards of economic reform and received a great deal of media attention.[1] In 1985 most of these people worked in enterprises classified as "units of other ownership" (private rather than state- or collectively owned enterprises).[1] These enterprises employed only 440,000 people out of the total urban labor force of 128 million in 1985 and paid average annual salaries of ¥1,373, only slightly higher than the overall urban national average.[1]