Contest of Mayors are offered a very similar mixture of both high- and regular-value Plumbob Points assignments. This ensures there’s a good variety of assignments to pick and choose from, depending on individual preferences or strategy.
Each different type of assignment that is offered to each mayor during each Contest (e.g. production in factories or commercial buildings; upgrading residential zones; collecting Keys etc.) has a slightly randomised nature. Otherwise, if the list of available assignments for each contest were the same for all mayors it could get posted online as each contest started, and give some mayors an unfair strategical advantage - as they’d know exactly which assignments would be coming up and plan accordingly.
There are no items or building upgrades in the game that have exactly the same complexity values, so there may be a slight variance in the Plumbob Point rewards for each assignment. For example: 'Corn' production takes 54 minutes yet 'Flour' takes only 27 minutes (in addition to differing amounts of ingredients needed) so to give the same Plumbob Point reward for each would be unfair.
Although this may result in slight fluctuations to the potential Plumbob Points each mayor could earn each week, the maximum potential Plumbob Points available are still well within the same range and any slight differences will rarely affect a chance of promotion or prize at the end of each contest. Ultimately, as long as you are active in the Contests and are completing the maximum Plumbob Point assignments available to you, there is always a strong chance to obtain the highest prizes and positions in the leaderboards.
Each time you complete, fail or cancel an assignment a new one is added in its place, so make sure to check the new ones regularly so as not to miss out on any possible high-value Plumbob Point chances!
