CREATE TABLE table_15823 ("District" TEXT, "Counties Represented" TEXT, "Party" TEXT, "First Elected" FLOAT, "Committee" TEXT)

What is the Highest first elected year that has a district of 06.0 6, and a committee of economic matters?
SELECT MAX("First Elected") FROM table_15823 WHERE "District" = '06.0 6' AND "Committee" = 'economic matters'
SELECT MAX("First Elected") FROM "table_15823" WHERE "Committee" = 'economic matters' AND "District" = '06.0 6'