According to Chapter 13, what does the development and maintenance of technology depend on?Chapter 13

At the very end of Chapter 13, Diamond argues that the
development and the maintenance of technology (to maintain technology, to Diamond, means
to keep using it instead of "losing" it as some Australians in the north stopped using
boomerangs, for example) depends on two things.

First, the
presence of technology in a given area depends to some extent on local invention.  If
local societies develop agriculture and become sedentary, they can develop
technology.

Second, technology in any given place needs to
be helped along by diffusion from other regions.  If neighboring societies have
technology, a society can "borrow" that technology from
them.

Therefore, to Diamond, the development and
maintenance of technology in a given area depends on local invention (which itself
depends on agriculture) and on diffusion from other societies.