For years, a persistent stereotype has suggested that Muslim workers observing Ramadan might be a safety risk in physically demanding jobs. A 14-year study from Spain has just turned that assumption on its head. The research reveals a stunning “Ramadan Effect”: during the holy month, workplace accidents involving Muslim workers actually drop by 4%, challenging employers and policymakers to rethink how religious accommodation can make everyone safer.
In an era of heated debate about immigration, integration, and religious diversity in the workplace, data is often drowned out by dogma. But a rigorous new economic study, published in the Journal of Economic Behavior and Organization, brings undeniable facts to the table. It shows that when it comes to one of the most visible Islamic practices—the month-long fast of Ramadan—the outcome is not what conventional wisdom might predict.
The paper, titled “The Ramadan Effect in the Workplace,” was authored by economists Paola Bertoli (University of Verona) and Veronica Grembi (Sapienza University of Rome). By analyzing a massive dataset of every single workplace accident in Spain from 2003 to 2016, they discovered that Muslim workers are significantly less likely to be injured during Ramadan. This isn’t just a statistical blip; it’s a robust finding that opens a new conversation about productivity, safety, and the value of religious flexibility.
Why Spain? A Perfect Laboratory
Spain is an ideal setting for this kind of study. Over the past two decades, its Muslim population has grown considerably, now making up about 4% of the total population, with large communities of workers from Morocco, Pakistan, and Senegal. Crucially, these workers are predominantly employed in blue-collar sectors like agriculture, construction, and services—jobs that are physically demanding and carry a higher risk of occupational injury.
The researchers were able to identify Muslim workers in the anonymized administrative data by using their country of nationality, focusing on first-generation immigrants from 48 predominantly Muslim countries (see list in the paper’s appendix). They compared this group to non-Muslim immigrant workers, primarily from Latin America and Eastern Europe, creating a powerful natural experiment.
The key to their identification strategy is the Islamic lunar calendar. Because the lunar year is 11 days shorter than the solar year, the dates of Ramadan shift dramatically over time. In 2003, Ramadan started in late October. By 2016, it began in early June. This rotation allowed the economists to isolate the effect of Ramadan from any other seasonal factors that might affect workplace safety. They could compare accident rates for Muslim and non-Muslim workers on the exact same calendar days, with the only difference being whether or not it was Ramadan for the Muslim group.
The Stunning Result: A 4% Drop in Accidents
After controlling for a vast array of factors—the day of the week, the week of the year, the province, and even the number of employed workers in each group—the result was clear and consistent.
During Ramadan, the total number of work accidents involving Muslim workers decreased by 4% compared to non-Muslim immigrant workers.
This is the core “Ramadan Effect.” It is the opposite of what a simple “physical stress” hypothesis would predict. Fasting from dawn to dusk, especially during long summer days, is undoubtedly taxing. One might expect dehydration and low blood sugar to lead to more mistakes and more injuries. But the data shows the reverse is true.
So, what is going on?
Why Do Accidents Decrease? The “Why” Behind the “What”
The study doesn’t just present the finding; it meticulously investigates the potential reasons. The authors explore several non-mutually exclusive explanations, falling into three main categories: adjustments in the labor market, behavioral changes, and workplace accommodations.
1. The “Incapacitation Effect” (Working Less):
One simple explanation is that Muslim workers are simply not at work as much during Ramadan. The data supports this. Using the Spanish Labor Force Survey, the researchers found that during the quarters that include Ramadan, Muslim workers are about 1.2% less likely to be employed. Furthermore, using a separate dataset on employment contracts, they discovered a 6.3% drop in the number of new contracts signed by Muslim workers during Ramadan, with the decrease concentrated in the commerce and service sectors—the very sectors where the accident drop was largest. This suggests that some workers may be delaying the start of new jobs or taking time off, reducing their exposure to workplace risk.
2. Behavioral Changes (Working More Safely):
Even if they are at work, workers might change their behavior to compensate for physical fatigue. They may become more cautious, take fewer risks, and pay closer attention to their tasks. The study also points to a powerful behavioral shift that has nothing to do with work itself: alcohol consumption. Using a national health survey, they found that during Ramadan, the probability that a Muslim respondent had consumed alcohol in the previous 30 days dropped by a staggering 34%. Since alcohol is a major risk factor for accidents both on and off the job, this dramatic reduction in consumption likely contributes to the overall safety effect.
3. Workplace Accommodations (Smarter Working):
This is perhaps the most encouraging finding for advocates of diversity and inclusion. The researchers gathered qualitative evidence that many Spanish employers and collective bargaining agreements explicitly allow for flexibility during Ramadan.
- In the agricultural sector in Almeria, Muslim workers can request a continuous workday and adjust their start and end times by an hour.
- Similar provisions exist in construction and steel sector agreements in the North African enclaves of Ceuta and Melilla.
- Major employers like the NH hotel chain and the Majestic hotel group officially allow flexible schedules for Muslim staff during Ramadan.
The researchers even conducted their own small survey of Muslim workers, which showed that those in high-risk jobs (who said their work “requires attention to avoid injury”) were significantly more likely to report that their employer allowed them to adjust their working hours during Ramadan. In other words, the workers who needed flexibility the most were getting it, and it was making them safer.
Table 1: The Evidence at a Glance—Key Findings of the “Ramadan Effect”
This table summarizes the study’s main quantitative results, showing the powerful and positive impact of Ramadan on workplace safety and behavior.
| What Was Measured | The “Ramadan Effect” (Change for Muslim Workers) | What This Tells Us |
|---|---|---|
| Workplace Accidents | ↓ 4% decrease (Daily accident count) | Fasting does not lead to more accidents; it leads to fewer. |
| New Employment Contracts | ↓ 6.3% decrease (Contracts signed per day) | Workers adjust at the “extensive margin” by delaying new jobs. |
| Probability of Being Employed | ↓ 1.2% decrease (Likelihood of having a job) | Some workers may take time off during the Ramadan quarter. |
| Alcohol Consumption | ↓ 34% decrease (Probability of drinking in last 30 days) | A major risky behavior plummets, contributing to overall safety. |
It Gets Stronger with the Fast: The Role of Duration and Time
The study also found that the effect is not uniform. It gets stronger as the fast gets harder.
- Longer Days, Fewer Accidents: The researchers calculated the length of the daily fast for each province based on its latitude and the time of year. In northern provinces like Asturias, summer Ramadan days are very long; in southern provinces like Cadiz, they are shorter. They found that the longer the average daily fast, the greater the decrease in workplace accidents. The physical challenge of a long day seems to trigger even more significant adjustments, whether through time off, extreme caution, or better accommodations.
- The Second Half Effect: By analyzing the data day-by-day, they discovered that the accident reduction isn’t immediate. It becomes pronounced and significant in the second half of Ramadan (days 15-30) . This suggests a “progression of behaviors”—as the month wears on and fatigue potentially builds, workers and employers refine their strategies to ensure safety.
Table 2: When and Where the Effect is Strongest
This table breaks down the heterogeneous effects, showing that the impact of Ramadan is most powerful in specific sectors and under specific conditions.
| Factor | Observation | Implication |
|---|---|---|
| Economic Sector | Largest accident drops in Construction (-0.8%) , Services (-3%) , and Commerce (-1%) . | These sectors often have more flexibility and are where many collective agreements exist (e.g., hotels). |
| Duration of Daily Fast | The longer the fasting day, the larger the decrease in accidents. | Harsher conditions trigger more significant safety adjustments. |
| Timing within Ramadan | The accident decrease is driven by the second half of the month (days 15-30). | It takes time for behavioral and workplace adjustments to fully take effect. |
| Community Size | The effect is stronger in provinces with a larger community of naturalized Muslims. | Larger, more established communities may have better awareness of rights and more leverage with employers. |
The Economic and Human Takeaway
This research is a powerful antidote to prejudice. It provides robust, data-driven evidence that a major religious observance does not pose a threat to workplace safety. On the contrary, the combination of individual behavioral changes (like abstaining from alcohol and being more cautious) and structural workplace accommodations (like flexible schedules) leads to a measurably safer environment.
The authors estimate that this 4% reduction translates to about 51 fewer workplace accidents per year across Spain, potentially saving over 1.1 million euros in direct costs alone. But the real value is in the human lives unaffected by injury and the demonstration that respecting religious diversity is not just a matter of political correctness—it is a practical tool for improving outcomes.
The study concludes with a crucial point for policymakers and businesses: religious practices like Ramadan are predictable. They are based on a calendar. Therefore, the cost of accommodating them—by adjusting shifts or meal breaks—can be anticipated and minimized. The evidence from Spain suggests that when employers and employees work together to respect religious needs, everyone wins. The “Ramadan Effect” is a win for workers, a win for businesses, and a win for a more intelligent, data-driven approach to diversity.
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