Harry's Pepperoni Pizza Parlor produced 10,000 large pepperoni pizzas last year that sold for $10 each. This year Harry's again produced 10,000 large pepperoni pizzas (identical to last year's pizzas) but sold them for $12 each. Based on this information we can conclude that Harry's production of large pepperoni pizzas this year:increased nominal GDP by $20,000 but left real GDP unchangedWhy are high rates of unemployment of concern to economists?there is lost output that could have been produced if the unemployed had been working