In the 1980s, companies started to manage their inventories much more closely than they had in the 1960s and 1970s. this was due to an increase in?

Interest rates

Explanation:

In the 1980's interest rates were as high as 21.5.

In 1959, a young senator wrote an article for a young magazine called "TV Guide" trumpeting the potential for the new medium of television to permanently change the way politics worked. In a little more than a year, that same senator, John F. Kennedy, would be elected president of the United States, thanks in no small part to his charismatic performance in a series of televised debates with opponent Richard Nixon and a TV ad campaign that featured some catchy jingles. Three years later, news coverage of Kennedy's assassination would captivate the country, becoming one of the first major tragedies covered by network news [source: Kaid]. By that time, television's place in shaping the political landscape was undeniable.