(02 Feb 2014, 2:41 pm)andreos1 wrote For the sake of 8 passengers, is it worth buying a smaller, cheaper vehicle and upping the frequency or a bigger, more expensive one and reducing frequency.
Assuming the frequency was to stay the same with a double decker (not sure where the reduction in frequency comes into play?), buying additional smaller single decked vehicles to meet the same seats per hour is likely to be more expensive in the long run.
With a bigger frequency comes more costs (insurance, various equipment a company uses to track vehicles etc, destination display equipment, drivers' wages etc).