Industry A grows agricultural products on its own farms. It pays wages of £40 million per year to its employees. Sales to other industries (B and C) are £50 million per year and direct sales to consumers are £10 million per year. Profits for this industry are £20 million per year.
Industry B is a manufacturer of finished products (including food products). It spends £30 million each year of purchases from industry A but it buys nothing from industry C. It sells £60 million of output to industry C, and £30 million of output to households for their personal consumption. It makes £30 million in profit each year and pays £30 million in wages to its employees.
Industry C is a large group of self-employed small businesses. The owners have "mixed incomes" (a combination of wages and profits) of £100 million per year. They buy inputs from industry A of £20 million per year and £60 million per year from industry B. This industry has sales to consumers of £180 million per year.
What would GDP be if industry C devoted £10 million of its purchases from B to investment (such as in increased inventories) and sold £10 million less to consumers?