1 New services for consumers are provided by banks.2 Models to study actual relations in an economy are used by economists.3 The growth of unemployment was predicted by the economists.4 Individuals are considered as suppliers of labour and capital by us.5 High employment was achieved by the government.6 Correct methods and models were chosen by the economist for his analysis.7 Many workers are employed by them in the service sector.8 Mining industry was developed in the 19th century in Great Britain, but many mines were closed down by them in the 20th century.9 The book was written by him in 1968.10 These principles in the analysis of the economic situation were followed by them.