The 80-20 rule

This was the observation by Pareto that 80% of a country's wealth is held by 20% of the population. This is roughly true for most countries.
http://en.wikipedia.org/wiki/80-20_rule#Practical_applications



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-Just for fun
-Based on airfare and seating plan from Singapore to Zurich, SIA, B777-300ER
Economy --> 228 seats (approx), 80.85%
Business --> 42 seats, 14.89% of load
First class --> 12 seats, 4.26% of load,

Economy --> $1700 per ticket, 44.89% of total revenue
Business --> $7900 per ticket, 38.43% of total revenue
First class --> $12000 per ticket, 16.68% of total revenue

-so.. 20% of the passengers pay for 50% of the flight

these are my own calculations for the purpose of study. I apologise for any errors
ref: http://www.seatguru.com/airlines/Singapore_Air/Singapore_Air_Boeing_777-300ER.php
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