No need to give more raises--just make them independent of promotion. If you get promoted and do an satisfactory job in your new role, /then/ you get a raise. O

No need to give more raises--just make them independent of promotion. If you get promoted and do an satisfactory job in your new role, /then/ you get a raise. Otherwise you go back to your old role with no change in compensation. People are willing to take a risk that they won't be good at their new job as long as the downside is limited to demotion without a decrease in compensation.