ECON UB 0015
New York University
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Exam (elaborations)
NYU-Competitive Analysis-Midterm practice solutions.
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---22November 20222022/2023A+
- 1. Webflicks. When Webflicks increased monthly subscription fees from $15 to $17, 
16% of its subscribers switched to alternative providers. 
(a) Provide an estimate of Webflicks demand elasticity. 
Answer: Using the percent variation method, we get 
 ≈ 
−16% 
17−15 
15 
= −1.2 
Alternatively, we can use the logarithm’s approach. A drop of 16% corresponds to a change 
from 100 to 84. 
 ≈ 
log(84) − log(100) 
log(17) − log(15) = −1.393 
(b) Assuming that Webflicks’ demand cu...
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