(St. Paul, MN)  --  A proposed increase in the state's minimum wage is on lawmakers' plate at the Minnesota Capitol as a House panel hears presentations on its economic impact.  Minnesota's minimum wage has been at 6-15 an hour since 2005, although many workers receive the federal minimum wage of 7-25.  Competing bills would raise the state's minimum wage by a dollar or two -- or automatically link it to inflation.  Also at the Capitol today, a Senate panel debates proposed Sunday liquor store sales in Minnesota.  It's a perennial issue at the legislature.  All the states neighboring Minnesota allow Sunday liquor sales.