Alphabet's market capitalization is generally listed as the market cap of GOOG, such as in this Wikipedia top companies list. But GOOGL has about the same market cap. Why are they not combined for Alphabet the company? Are they linked in some way behind the scenes that makes summing redundant? And does the same hold for the other stocks with two ticker symbols (four more in S&P 500)?
(I know there is a similar sounding question, Correct Alphabet market cap calculation, but I think that one's more about discrepancies in the numbers rather than the summing.)