Although everybody's "wages" are fixed at the same level by a ferocious egalitarian principle, there is something which sounds rather a lot like market mechanisms -- or at least, like a command economy simulating market mechanisms -- mediatized not by money, but by leisure time. You could look at it like this: workers are (in a way) paid different hourly rates, but hours that they work are carefully regulated to ensure that all total incomes are equal:
"The supply of volunteers is always expected to fully equal the demand," replied Dr. Leete. "It is the business of the administration to see that this is the case. The rate of volunteering for each trade is closely watched. If there be a noticeably greater excess of volunteers over men needed in any trade, it is inferred that the trade offers greater attractions than others. On the other hand, if the number of volunteers for a trade tends to drop below the demand, it is inferred that it is thought more arduous. It is the business of the administration to seek constantly to equalize the attractions of the trades, so far as the conditions of labor in them are concerned, so that all trades shall be equally attractive to persons having natural tastes for them. This is done by making the hours of labor in different trades to differ according to their arduousness. The lighter trades, prosecuted under the most agreeable circumstances, have in this way the longest hours, while an arduous trade, such as mining, has very short hours. There is no theory, no a priori rule, by which the respective attractiveness of industries is determined. The administration, in taking burdens off one class of workers and adding them to other classes, simply follows the fluctuations of opinion among the workers themselves as indicated by the rate of volunteering [...]"