When this setting is off, only Project managers and up are able to see the hourly rates within an activity. Otherwise everyone will be able to see and change hourly wages.
Kilometer allowance
Default Kilometer allowance used in all new project, unless specified differently in a project or activity.
Cost Multiplier
An activity of a user can have costs, this setting will multiply that cost for invoicing to the customers. Example: a cost multiplier of 0.50 will give a 50% discount to the customer, while a cost multiplier of 1.5 will give a 50% margin on costs. Default the cost multiplier is 1.