in the euqation, what does the parameter v means? please try!!!

to understand the nature of technological progress. Sometimes, this strand of research is called endogenous growth theory because it tries to make longrun growth endogenously determined.\" Let us think of E as knowledge. The development of new knowledge requires labour and other resources. A simple way to make the growth of knowledge endogenous is to introduce a sector for research and development (R&D) in the modeL Assume, for simplicity, that this sector uses only labour and that the role of the R810 sector is to increase the technology factor according to the following 'production function': AE=N:'. N. is the number of workers employed in the R&D sector. The parameter a reects the productivity of the R&D sector and we assume that the parameters v and 0 are positive. The parameter 9 measures how useful existing knowledge is when producing new knowledge. The basic idea here is that we use labour and knowledge to produce new knowledge, so the more knowledge we have, the more easily we can produce new knowledge. It is hard to imagine someone inventing the car before the engine had been invented, or the laptop being invented before the mainframe computer