user: ### NOW ANSWER:
Question: What is the average rank for USA when the market value is 407.2 billion?
Columns: ['Rank', 'Company', 'Headquarters', 'Industry', 'Sales (billion $)', 'Profits (billion $)', 'Assets (billion $)', 'Market Value (billion $)']
Types: ['real', 'text', 'text', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'JPMorgan Chase', 'USA', 'Banking', 115.5, 17.4, 2117.6, 182.2]
SQL:

assistant: SELECT AVG("Rank") FROM "Table" WHERE "Headquarters" = 'USA' AND "Market Value (billion $)" > 407.2;