A $10,000 investment in 1984 would be worth $51,710 today, or a 4.4% compounded annual growth rate. That's a sorry performance compared to the S&P 500, which would be worth $263,000, or a 9% return, though slightly better than Verizon's own, or a 4.2% CAGR.
https://www.fool.com/investing/2022/11/17/if-you-invested-10000-in-att-in-1984-this-is-how-m/