The take-off also needs a group of entrepreneurs in the society who pursue innovation and accelerate the rate of growth in the economy. For such an entrepreneurial class to develop, firstly, an ethos of "delayed gratification", a preference for capital accumulation over expenditure, and high tolerance of risk must be present. Secondly, entrepreneurial groups typically develop because they can not secure prestige and power in their society via marriage, via participating in well-established industries, or through government or military service (among other routes to prominence) because of some disqualifying social or legal attribute; and lastly, their rapidly changing society must tolerate unorthodox paths to economic and political power.