user: Question: Name the market cap where 2013 rev is 2.8
Columns: ['April 2013 Cum. Rank', 'Name', 'Rank 2012', 'Rank 2013', 'Base', '2013 rev (bil. USD )', '2013 Profit (mil. USD )', 'Assets 2013 (bil.$)', 'Market cap March 15 (mil.$)']
Types: ['real', 'text', 'real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'Freeport-McMoRan', 235.0, 273.0, 'United States', '18.0', '3,000', '35.4', 23100.0]
SQL:

assistant: SELECT "Market cap March 15 (mil.$)" FROM "Table" WHERE "2013 rev (bil. USD )" = '2.8';