Apple is widely considered the most valuable company in the world. Why? Because it has the largest market capitalization. In other words if you were to buy the entire company at the market price, you would shell out $600 billion.
Question is - does this not make Apple the most expensive company as opposed to most valuable?
Other " most valuable" companies from the past - Intel Microsoft cicso ge. In hindsight they were the most expensive, since their market cap is on average 20-40% of peak value.
Which company in your mind is the most valuable? And what is your criterion to assign value?