In order that school districts may secure the benefits of knowledge of educational methods and practices in other school districts either inside or outside the United States and for the purpose of securing the educational benefits of international understanding and good will, boards of education may enter into contracts with boards of education or other educational authorities for the exchange of teaching services and in the performance of such contracts may send teachers in their employ to serve in other districts in exchange for similar services to be furnished to them by such other districts. Each board of education exchanging teachers under this section may continue such teacher employees on its own payroll in the same manner as though such teachers were rendering the services in the district in which they are regularly employed.

This section does not authorize any expenditure in excess of the payment of salaries.