MCQOPTIONS
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				| 1. | 
                                    _Calculate the income elasticity for a household when the income of this household rises by 5% and the demand for buttons does not change at all.$? | 
                            
| A. | Infinity | 
| B. | 1 | 
| C. | Zero | 
| D. | 5 | 
| Answer» D. 5 | |