CREATE TABLE table_30781 ("Player" TEXT, "Matches" FLOAT, "Overs" TEXT, "Wickets" FLOAT, "Average" TEXT, "Economy" TEXT, "BBI" TEXT, "4wi" FLOAT)

What is the economy of the player with BBI of 3/33?
SELECT "Economy" FROM table_30781 WHERE "BBI" = '3/33'
SELECT "Economy" FROM "table_30781" WHERE "BBI" = '3/33'