79949
Jevons argued that increased efficiency in the use of coal would tend to increase the demand for coal , and would not reduce the rate at which England 's deposits of coal were running out .
 Jevons
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jevons