Media ownership changed dramatically from the $1980$ s to the $2000$ s$,$ such that:

There were more than $50$ major media companies in the $1980$ s$,$ and fewer than $10$ in the $2000$ s

There were fewer than $50$ major media companies in the $1980$ s$,$ and more than $500$ in the $2000$ s

There were fewer than $10$ major media companies in the $1980$ s$,$ and more than $50$ in the $2000$ s

There were more than $500$ major media companies in the $1980$ s$,$ and fewer than $50$ in the $2000$ s