secondary sector and there are 164 businesses in this sector. 20,186 people are employed in the tertiary sector, with 1,461 businesses in this sector. This is a total of over 24,000 jobs, since Aarau's population is about 16,000 it draws workers from many surrounding communities. there were 8,050 total workers who lived in the municipality. Of these, 4,308 or about 53.5% of the residents worked outside Aarau while 17,419 people commuted into the municipality for work. There were a total of 21,161 jobs (of at least 6 hours per week) in the municipality. The largest employer in Aarau is the cantonal government, the offices of which are distributed across the entire city at numerous locations. One of the two head offices of the Aargauer Zeitung, Switzerland's fifth largest newspaper, is located in Aarau, as are the Tele M1 television channel studios, and several radio stations. Kern & Co., founded in 1819, was an internationally known geodetic instrument manufacturer based in Aarau. However, it was taken over by Wild Leitz in 1988, and was closed in 1991. The small scale of Aarau causes it to continually expand the borders of its growth. The urban center lies in the middle of the "Golden Triangle" between Zürich, Bern, and Basel, and Aarau is having increasing difficulty in maintaining the independence of its economic base from the neighboring large cities. The idea of merging Aarau with its neighboring suburbs has been recently discussed in the hope of arresting the slowly progressing losses. Manufacture include bells, mathematical instruments, electrical goods, cotton textiles, cutlery, chemicals, shoes, and other products. Aarau is famous for the quality of their instruments, cutlery and their bells. Markets and fairs Every Saturday morning there is a vegetable market in the Graben at the edge of the Old City. It is supplied with regional products. In the last week of September the MAG (Market of Aarauer Tradesmen) takes place there, with regional companies selling their products. The "Rüeblimärt" is held in the same place on the first Wednesday in November, which is a Carrot fair. The Aarau fair is held at the ice skating rink during the Spring. Transport Aarau railway station is a terminus of the S-Bahn Zürich on the line S3. The town is also served with public transport provided by Busbetrieb Aarau AG. Population The population of Aarau grew continuously from 1800 until about 1960, when the city reached