Nikhil Datta
@nikdatta.bsky.social
Economist. Assistant prof @ warwick, fellow @ CEP LSE, PhD alum @ UCL. Child of immigrants. Serene since 17/06/06. http://nikhil-datta.com
Glad to see my new piece in The Conversation is stimulating informed debate
October 25, 2025 at 6:49 AM
Glad to see my new piece in The Conversation is stimulating informed debate
www.thisismoney.co.uk/money/cars/a...
Good to see coverage of mine and Johannes Brinkmann's @cagewarwick.bsky.social on the RTFO. Here's a nice graph showing the benefits...
Good to see coverage of mine and Johannes Brinkmann's @cagewarwick.bsky.social on the RTFO. Here's a nice graph showing the benefits...
July 17, 2025 at 8:47 AM
www.thisismoney.co.uk/money/cars/a...
Good to see coverage of mine and Johannes Brinkmann's @cagewarwick.bsky.social on the RTFO. Here's a nice graph showing the benefits...
Good to see coverage of mine and Johannes Brinkmann's @cagewarwick.bsky.social on the RTFO. Here's a nice graph showing the benefits...
5. Based on the government's current estimated cost of overall damage to society per tonne of carbon (£312), the benefits of the policy far outweigh the cost. For every £1 cost to consumers, the policy has saved between £1.37 to £25 worth of carbon damage over time. The average lies at £5.70.
April 24, 2025 at 10:12 AM
5. Based on the government's current estimated cost of overall damage to society per tonne of carbon (£312), the benefits of the policy far outweigh the cost. For every £1 cost to consumers, the policy has saved between £1.37 to £25 worth of carbon damage over time. The average lies at £5.70.
4. The implied cost per tonne of co2 saved due to the RTFO (in 2024 prices) in turn experiences a lot of volatility, especially when compared to other policies. Within 2018 alone the cost of saving a tonne of carbon ranged from £13 in March to over 10 times that amount 9 months later.
April 24, 2025 at 10:12 AM
4. The implied cost per tonne of co2 saved due to the RTFO (in 2024 prices) in turn experiences a lot of volatility, especially when compared to other policies. Within 2018 alone the cost of saving a tonne of carbon ranged from £13 in March to over 10 times that amount 9 months later.
... We decompose the pump price increases by carrying out two exercises, one where we fix the RTFO at the 2013-2018 level, and one where we fix biofuel prices to track fossils. The decompositions show a role for both the RTFO level & changes in prices to biofuels. The latter drive volatility.
April 24, 2025 at 10:12 AM
... We decompose the pump price increases by carrying out two exercises, one where we fix the RTFO at the 2013-2018 level, and one where we fix biofuel prices to track fossils. The decompositions show a role for both the RTFO level & changes in prices to biofuels. The latter drive volatility.
3. The cost increase is driven by a combination of the increase in the RTFO, as well as increases in biofuels (ethanol and biodiesel). Biodiesel is notably always higher than fossil fuels by quite a considerable amount...
April 24, 2025 at 10:12 AM
3. The cost increase is driven by a combination of the increase in the RTFO, as well as increases in biofuels (ethanol and biodiesel). Biodiesel is notably always higher than fossil fuels by quite a considerable amount...
2. The RTFO has pushed up pump prices, and the increase has varied a lot. Impacts have ranged from negligible, to substantial. In 2021 the RTFO added up to 8ppl to unleaded, and in 2022 up to 14ppl to diesel. The RTFO has also increased volatility in pump prices.
April 24, 2025 at 10:12 AM
2. The RTFO has pushed up pump prices, and the increase has varied a lot. Impacts have ranged from negligible, to substantial. In 2021 the RTFO added up to 8ppl to unleaded, and in 2022 up to 14ppl to diesel. The RTFO has also increased volatility in pump prices.
1. The RTFO has risen considerably since introduction. The current obligation stands at 13.5%,having started at 2.5%.
April 24, 2025 at 10:12 AM
1. The RTFO has risen considerably since introduction. The current obligation stands at 13.5%,having started at 2.5%.
2. Rejection rates don't tell us much. They've been flat (and non-zero) for a long time, but that doesn't mean planning hasn't become more cumbersome. Our research shows that projects face large amounts of paperwork, regulation and delays, particularly larger projects... 3/n
March 12, 2025 at 10:51 AM
2. Rejection rates don't tell us much. They've been flat (and non-zero) for a long time, but that doesn't mean planning hasn't become more cumbersome. Our research shows that projects face large amounts of paperwork, regulation and delays, particularly larger projects... 3/n
1. Applications does not equal total units. We break down each application into # housing units in our work, and show there has been a massive compositional shift to big housing projects. When adjusting for this, # units applied for didn't start declining until 2018 (left image is ours). 2/n
March 12, 2025 at 10:51 AM
1. Applications does not equal total units. We break down each application into # housing units in our work, and show there has been a massive compositional shift to big housing projects. When adjusting for this, # units applied for didn't start declining until 2018 (left image is ours). 2/n
5 years ago today Britain left the EU. Between 2020-2023, Brexit drove up food prices by 4% a year on average.
Research from Jan David Bakker, @joshdelyon.bsky.social , @richarddavies.bsky.social and myself.
You can read the paper here: tinyurl.com/27vjakwa
Research from Jan David Bakker, @joshdelyon.bsky.social , @richarddavies.bsky.social and myself.
You can read the paper here: tinyurl.com/27vjakwa
January 31, 2025 at 12:03 PM
5 years ago today Britain left the EU. Between 2020-2023, Brexit drove up food prices by 4% a year on average.
Research from Jan David Bakker, @joshdelyon.bsky.social , @richarddavies.bsky.social and myself.
You can read the paper here: tinyurl.com/27vjakwa
Research from Jan David Bakker, @joshdelyon.bsky.social , @richarddavies.bsky.social and myself.
You can read the paper here: tinyurl.com/27vjakwa
The view from my office this morning weren't half bad
January 12, 2025 at 9:10 AM
The view from my office this morning weren't half bad
10. On the supply side, ZHC job adverts get 25% MORE applicants for the otherwise same job, in the same establishment, in the same year. (For you ln(1+x) haters there are a bazillion other specs using other transformations which give the same result in the appendix). 13/n
October 9, 2024 at 9:59 AM
10. On the supply side, ZHC job adverts get 25% MORE applicants for the otherwise same job, in the same establishment, in the same year. (For you ln(1+x) haters there are a bazillion other specs using other transformations which give the same result in the appendix). 13/n
9. Lastly, on the demand side I don't find any evidence that slack labour markets allow firms to take on more ZHC workers. I essentially find the opposite. 12/n
October 9, 2024 at 9:59 AM
9. Lastly, on the demand side I don't find any evidence that slack labour markets allow firms to take on more ZHC workers. I essentially find the opposite. 12/n
8. I also show firms use ZHCs to weather (sorry) demand shocks. Some of my establishments are al-fresco and so exposed to weather shocks. Al-fresco establishments are shown to adjust ZHC hours v flexibly wrt weather conditions, which is a proxy for demand in this setting. 11/n
October 9, 2024 at 9:57 AM
8. I also show firms use ZHCs to weather (sorry) demand shocks. Some of my establishments are al-fresco and so exposed to weather shocks. Al-fresco establishments are shown to adjust ZHC hours v flexibly wrt weather conditions, which is a proxy for demand in this setting. 11/n
7. ZHCs also get used to respond to separations - when fixed hour workers leave, ZHCs increase temporarily. The first figure is cover rates at the exact job role level, the second allows for substitutability across roles. It peaks at around 21%, close to the absentee cover. 10/n
October 9, 2024 at 9:57 AM
7. ZHCs also get used to respond to separations - when fixed hour workers leave, ZHCs increase temporarily. The first figure is cover rates at the exact job role level, the second allows for substitutability across roles. It peaks at around 21%, close to the absentee cover. 10/n
6. On the firm side, using data on unexpected worker absences (e.g. sick days) I show ZHCs get used as a form of cover for temporary absentee shocks. I find cover rates of about 25% when we allow for job-role substitutability (e.g. a cleaner can cover for a waiter). 9/n
October 9, 2024 at 9:57 AM
6. On the firm side, using data on unexpected worker absences (e.g. sick days) I show ZHCs get used as a form of cover for temporary absentee shocks. I find cover rates of about 25% when we allow for job-role substitutability (e.g. a cleaner can cover for a waiter). 9/n
5. W-o-W hour changes are short run changes. When looking at the long run distribution of hours for each worker, and we put it in earnings terms we get a slightly different picture. This figure presents the distribution of IQRs in earnings for workers, over all their weeks. 7/n
October 9, 2024 at 9:56 AM
5. W-o-W hour changes are short run changes. When looking at the long run distribution of hours for each worker, and we put it in earnings terms we get a slightly different picture. This figure presents the distribution of IQRs in earnings for workers, over all their weeks. 7/n
4. In general, despite not having guaranteed hours, many ZHCs face little week-on-week hours volatility. The median worker sees approx. +-2 hours. However there are some who see a lot more. 6/n
October 9, 2024 at 9:56 AM
4. In general, despite not having guaranteed hours, many ZHCs face little week-on-week hours volatility. The median worker sees approx. +-2 hours. However there are some who see a lot more. 6/n
3. ZHCs work on average at least once during 70% of weeks of their employment. An equivalent fixed hour worker would work at least 89% (depending how they took holiday). But there's a lot of heterogeneity - a common theme throughout the analysis. 5/n
October 9, 2024 at 9:56 AM
3. ZHCs work on average at least once during 70% of weeks of their employment. An equivalent fixed hour worker would work at least 89% (depending how they took holiday). But there's a lot of heterogeneity - a common theme throughout the analysis. 5/n
2. ZHCs have much higher turnover rates in comparison to their fixed hour counterparts. This holds even when looking at the same job-role (e.g. waiter). A non-trivial prop of ZHC workers don't work a single shift, and ZHCs stay about a 1/3 of the time as fixed hour. 4/n
October 9, 2024 at 9:55 AM
2. ZHCs have much higher turnover rates in comparison to their fixed hour counterparts. This holds even when looking at the same job-role (e.g. waiter). A non-trivial prop of ZHC workers don't work a single shift, and ZHCs stay about a 1/3 of the time as fixed hour. 4/n
1. ZHCs are most prevalent amongst young people, living in high student population areas w/ higher education levels. But, they aren't limited to just one demographic type. 3/n
October 9, 2024 at 9:55 AM
1. ZHCs are most prevalent amongst young people, living in high student population areas w/ higher education levels. But, they aren't limited to just one demographic type. 3/n
🚨New @cep-lse.bsky.social working paper: Why do flexible work arrangements exist? Read on if you're interested in work schedule-flexibility and zero-hours contracts! 1/n
October 9, 2024 at 9:53 AM
🚨New @cep-lse.bsky.social working paper: Why do flexible work arrangements exist? Read on if you're interested in work schedule-flexibility and zero-hours contracts! 1/n
These hurdles come *after* the first approval of an application, implying first round approval rates don't capture many of the barriers to final build. This is why we see such long delays for big projects which we're not more reliant on for housing supply. 5/n
September 19, 2024 at 11:09 AM
These hurdles come *after* the first approval of an application, implying first round approval rates don't capture many of the barriers to final build. This is why we see such long delays for big projects which we're not more reliant on for housing supply. 5/n