Q. Characteristics of endogenous growth theory?

There are many different explanations for technological progress. Most of them, though, have many common characteristics: 

• They are based on constant return to scale for capital. So MP_K isn't a decreasing function of K in these models.
• They consider technological development as a public good.
• They focus more on human capital.
• It is possible for government to affect the growth rate. Higher savings also results in higher growth, not just higher GDP per capita.
• They predict convergence of GDP per capita between countries in the long run. This is a consequence of public good property of the technological developments.