Types of effects. 1  Direct rebound effect: An increase in consumption of a good is caused by the lower cost of use. This is caused by the substitution effect. 2  Indirect rebound effect: The lower cost of a service enables increased household consumption of other goods and services.
Modules are pieces of code that can be loaded and unloaded into the kernel upon demand. They extend the functionality of the kernel without the need to reboot the system. For example, one type of module is the device driver, which allows the kernel to access hardware connected to the system.
Module testing is the testing of complete code objects as produced by the compiler when built from source. A library may be composed of a single compiled object or several compiled objects. There is only a slight difference between unit testing and module testing.