Teams from nine secondary schools faced tasks– learning about branding and marketing and testing out their negotiation and selling skills.
First the students, aged 15-17, worked with Calderdale Council's transport section on a logistics task.
They had to negotiate rates for washing vehicles, working out how long it would take to clean buses and vans.
Eight successful teens who made it through to the final then undertook the branding and selling task with the help of John Walker, from Calderdale Markets.
After sessions with Chris Sands from You Are Here on branding, and Liz Baker from Digital Consortium at the Elsie Whiteley Innovation Centre on market selling, the teens ran stalls in Russell Street, Halifax.
They branded and sold a variety of products, with proceeds going to Calderdale Mayor Arshad Mahmood's nominated charity.
Finally, Calderdale's "Sir Alan" – Craig Hamer, operations manager of Dews Garages – decided which team had performed best.
He "hired" his chosen candidate and gave feedback to the others on their performances. First prize went to 15-year-old Laura Hopkinson, from Holy Trinity Senior School.
Mike James from the council's Children and Young People's Services said: "They thoroughly enjoyed the two days and learnt a lot about negotiating and understanding customers' needs."
Cabinet Member for Children and Young People's Services, Craig Whittaker, said: "The competition encourages young people to come up with innovative ideas and to look at how best to solve problems."