9) which of these would best describe an immediate effect of the invention and mass production of the light bulb?
a) time became standardized
b) agriculture worked longer hours
c) railroad companies expanded routes
d) longer factory hours for all workers

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.