In a real-world acquisition, a buyer almost never pays just the market cap. To convince a majority of shareholders to sell, a buyer would typically need to offer a premium of 20% to 40% above the current stock price. This could push the actual acquisition cost closer to $5 trillion .

The "price tag" for a company like Google is a moving target that depends on several financial factors:

GOOG. Alphabet Inc. 348.96 +0.13% NasdaqGS - BOATS Real Time Price • USD. Yahoo Finance Alphabet (Google) (GOOG) - Market capitalization