Key TakeawaysShares of Wynn Resorts, Las Vegas Sands, and MGM Resorts International have been lifted by China's measures to boost its economy.The steps by Beijing are expected to boost business at their casinos in Macau.Wynn Resorts also received an upgrade from Morgan Stanley. Shares of Wynn Resorts (WYNN), Las Vegas Sands (LVS), and MGM Resorts International (MGM) gained again Friday on optimism that the big stimulus package announced by China will increase business at their casinos in Macau.  All three h ...