Figure: Piano Lessons 
Which event would shift the demand curve for piano lessons from D1 to D2, as shown in the diagram?
Definitions:
Conversion Costs
The sum of direct labor and manufacturing overhead expenses involved in turning raw materials into completed goods.
Direct Method
A cash flow statement preparation method that lists major categories of gross cash receipts and payments, directly showing sources and uses of cash.
Step-Down Method
An allocation method used in cost accounting to allocate service department costs to production departments in a sequential manner based on certain criteria.
Custodial Services
Services provided by companies or individuals focusing on the cleaning and maintenance of buildings or properties.
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