Refer to the graph showing the demand for books. A movement from point E to point D is caused by: 
Definitions:
Quality of Income
A measure of how easily accounting income can be converted to cash, indicating the reliability of earnings.
Gross Profit Percentage
A financial metric that represents the proportion of money left over from revenues after accounting for the cost of goods sold, expressed as a percentage.
Cost of Goods Sold
The direct costs attributable to the production of the goods sold by a company.
Return on Equity Ratio
A measure of financial performance calculated by dividing net income by shareholders' equity, indicating how well a company uses investments to generate earnings growth.
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