External economy refers to the reduction of production costs due to various external factors of the enterprise; external diseconomy refers to the increase of production costs due to various external factors of the enterprise. These influencing factors include the distance from the raw material supply place and the product sales market. Distance, market size, the convenience of transportation and communication, development level of other related companies, etc. According to the above definition, which of the following is the following that belongs to the external economy? ['An automobile manufacturing company has reduced the production cost of automobiles due to increased productivity and improved management.', "The price of a company's products is lower than that of other companies in the same industry because the government provides cheap raw materials and grants tax relief.", "A country's preferential tariff policy on products exported by a certain company in China makes the export volume of the company's products greatly exceed last year, and thus has achieved huge profits.", 'The global economic recovery has increased the profits of foreign trade export companies.']