C Doidge, A Burrell, G van Schaik, J Kaler
A qualitative survey approach to investigating beef and dairy veterinarians' needs in relation to technologies on farms
Animal : an international journal of animal bioscience
analyses teacher quality end without assessment economic value altered teacher quality paper combines information teacher effectiveness economic impact higher achievement begins overview known relationship teacher quality student achievement provides basis consideration derived demand teachers comes impact economic outcomes alternative valuation methods based impact increased achievement individual earnings impact low teacher effectiveness economic growth aggregate achievement teacher one standard deviation mean effectiveness annually generates marginal gains 400000 present value student future earnings class size 20 proportionately higher larger class sizes alternatively replacing bottom 58 percent teachers average teachers could move us near top international math science rankings present value 100 trillion