And now a great crew of young men were being gathered to man them. They were all volunteers. There were to be one million ships, and that meant ten million men would be needed. Only modern methods could have made that possible, but with three populations, totaling over twenty billions, a sufficient number of volunteers came forward to make the work easy. As fast as these men came to the conscription stations, they were put into the new machines. And here also modern methods had helped. The Waterson system of material energy release had been so successful, that the price of a completed car had dropped to well under one hundred dollars for the small two-man machines. And even for the interplanetary models not more than two thousand dollars needed to be paid, for the raw materials were absolutely free, the labor was mechanically reduced to almost nothing, and as the energy that drove these machines was as cheap as the raw materials, they merely charged enough to make the venture pay a decent return on investment and to pay the wages of the few machine supervisors and the office staff. Men worked five days a week on three-hour shifts in the factories, but longer hours and more pay went to the builders, to the men who had to manually control the building construction machinery, for law forbade the building of offices on the mass production scheme, since that meant an unvaried, monotonous city. But everywhere wages were high, for wages depend, not on the amount of work men do, but on the amount of finished product they can turn out. The men accomplished more, and were paid more, but they worked less. It had taken many years to finally convince the Earth of that, but the example of American labor, with its shorter hours and higher wages was proof enough. And then the influence of the mighty energies Waterson had released made it even more apparent. Mars had already developed the system under the force of the released atomic energies. High wages and cheap machines had meant that everyone owned one. And so absolutely safe were they that they commanded perfect confidence. This had been a big factor in the making of this mighty fleet. Everyone knew how to operate the machines, so it was easy to fill the places on the machines with pilots.