The following list of items is related to aggregate demand: 1 . Entrepreneurial ability 2 . Consumer expectations 3 . Degree of excess capacity 4 . Personal income tax rates 5 . Productivity 6 . National income abroad 7 . Business taxes 8 . Domestic resource availability 9 . Prices of imported products 1 0 . Profit expectations on Investments Which two factors would most likely cause a change in investment spending