ephion comments on It's the Same Five Dollars! - Less Wrong

23 Post author: Z_M_Davis 08 March 2009 07:23AM

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Comment author: ephion 19 November 2013 04:15:13PM 0 points [-]

It seems pretty clear that the connotation of 'cost' in this instance is 'time cost' and not 'total cost.' Fuel cost is highly variable based on the price of fuel and the efficiency of your car.

Comment author: [deleted] 19 November 2013 04:18:17PM 1 point [-]

And why should it be time cost rather than total cost that matters?

Comment author: ephion 19 November 2013 04:34:15PM 0 points [-]

Of course the total cost matters. However, the time cost is the point of the post, and including fuel cost in the calculation would be needlessly complex and generally unhelpful.

A 20 minute drive costs $8.33 in time given $25/hour time valuation. Depending on roads, traffic, etc. that might be about 10-12 miles. My car gets 45mpg on average, and gas costs around $3.30. My fuel cost is about $0.73. If gas cost $8/gallon and I drove a 25mpg car, then my fuel cost is $3.84. This variability makes figuring the total cost highly individual to situation, and not entirely relevant to the point of equating time and money.