What is grade inflation? Wikipedia gives two descriptions:
- grading leniency: the awarding of higher grades than students deserve, which yields a higher average grade given to students
- the tendency to award progressively higher academic grades for work that would have received lower grades in the past.
In this study, we need to take the second description into account. Grade inflation in this second sense is something a lot of people think, other people say it’s not the case and this study says… grade inflation at English primary schools can increase the price of surrounding houses by up to £7,000. Do note this is a working paper and not a peer reviewed study!
From the press release:
The study finds that as parents are drawn to areas with what appear to be higher school scores, the demand for housing escalates and poorer residents are driven out. The researchers examined data from more than 23,000 neighbourhoods in England, using results of more than five million students enrolled since 1998.
The study, published as a QMUL School of Economics and Finance Working Paper, looked at the period from 1998 to 2007, when English schools used a process called ‘borderlining’ to regrade exams from students who narrowly missed out on a higher Key Stage result.
Erich Battistin, Professor of Economics at QMUL and lead author of the study says the period provides a “perfect test environment” to interrogate an important policy question: can grade inflation change the composition of neighbourhoods?
Borderlining was abolished in 2007 by the Department of Education, following evidence that the procedure caused grade inflation in primary schools for thousands of students. However, the effects of grade inflation that accumulated over one decade before the abolition of borderlining triggered inequalities across neighbourhoods that are persistent and identifiable through to the present day.
The results of the study, co-authored with Dr Lorenzo Neri from QMUL, show that a three percentage point increase (from a baseline of 26 per cent) in the number of students who perform above expectations at Key Stage 2 increases local house prices by 1.5 per cent.
The effect on prices is more dramatic in areas with more than one good school. According to Dr Neri, this is due to a “hedging effect,” where parents gravitate more strongly to areas that have a number of highly-rated schools. He says that in these areas the combined grade inflation of more than one school can increase house prices by three per cent, or £7,000.
“What our study shows is that even very small levels of grade inflation can make a significant impact on house prices,” says Professor Battistin. “The reason for this is well documented by previous studies: parents respond to even the smallest marginal differences in the performance of local schools. Over time, this has a significant effect on the composition of the local neighbourhood and makes the area less affordable for poorer families.
“It’s not new to show that prices and demography are influenced by quality — but what we show is that they can be affected significantly even by a false perception of quality. It’s not really there, it’s just statistical noise — sometimes generated by the benign intentions of markers to bump up marginal students, not necessarily for accountability purposes.” He adds that the results are relevant in the context of recent cheating scandals, in the UK and elsewhere, which he says need to be understood in terms of policy implications as well as in the context of standards and behaviour.
The researchers also show that the effects spill over to the composition of businesses and demography in local areas. They demonstrate that neighbourhoods in the catchment of schools with more grade inflation experience a more pronounced increase in the number of grocery shops, restaurants and coffeehouses surrounding schools, most likely because local retailers respond to the arrival of richer homeowners.
The researchers compared similar blocks in the catchment of schools which, without borderlining, would have scored the same quality in national performance tables. The underlying assumption is that prices across these blocks would have changed similarly over time had manipulation not occurred.
They found a sharper price change for blocks in the catchment of schools where scores were the most inflated. The research methods included the use of large administrative databases and econometric analysis exploiting micro-level data on students, schools, house transactions and businesses. Results survived to the inclusion of neighbourhoods’ socio-economic characteristics at a very fine level; furthermore, regulation regarding the borderlining practice, coupled with a series of robustness checks, ensured that a clear causal relationship can be established.
Abstract of the working paper:
We show that grading standards for primary school exams in England have triggered an inflation of quality indicators in the national performance tables for almost two decades. The cumulative effects have resulted in significant differences in the quality signaled to parents for otherwise identical schools. These differences are as good as random, with score manipulation resulting from discretion in the grading of randonly assigned external markers. We find large housing price gains from the school quality improvements artificially signaled by manipulation as well as lower deprivation and more businesses catering to families in local neighbourhoods. The design ensures improved external validity for the valuation of school quality with respect to boundary discontinuities and has the potential for replication outside of our specific case study.