A takeover offer was submitted to MGM Resorts International on Monday by Barry Diller’s firm, People Inc., valuing the casino operator at more than 18 billion dollars. The corporate proposal arrived only days after another major hospitality acquisition in the United States gaming sector, indicating a wave of consolidation across the domestic casino industry. People Inc., which was previously known as IAC, announced it made an offer of 48.30 dollars per share in cash for the shares of MGM Resorts that it does not currently own. The proposal marks a premium of roughly 10.6 percent over the closing price of…