Economic Performance of Nigerian States Through the Lens ofSatellite-Recorded Nighttime Light Data

Measuring the economic health of a nation is often a slow, bureaucratic process. Governments rely on surveys, tax records, and business reports to calculate how much money is being made, but these methods can be incomplete, delayed, or entirely missing for specific regions. In countries like Nigeria, the world's most populous African nation, this gap is particularly wide. While the country's total economic output is tracked, the specific economic performance of its thirty-six individual states often remains a mystery. Without this detailed data, it is difficult for leaders to know which areas are thriving, which are struggling, or where resources should be sent to help. For decades, economists have searched for a way to see economic activity from above, looking for a signal that is hard to fake and easy to measure from space.

The answer lies in the dark. When the sun sets, the lights that turn on across a landscape tell a story about human activity. Cities glow with streetlamps and office buildings, industrial zones hum with machinery, and commercial centers buzz with energy. This pattern of illumination, captured by satellites orbiting the Earth, has become a powerful tool for economists. The logic is simple: where there is economic activity, there is often light. By studying the brightness of these nighttime lights, researchers can estimate how much money a region is generating, even when official statistics are unavailable. This approach offers a way to peer into the economic heartbeat of a country in near real-time, bypassing the delays of traditional data collection.

A recent study by Kingsley Success Ikani, a researcher at the University of Economics in Katowice, takes this concept and applies it to the complex economic landscape of Nigeria. The goal was to create a detailed map of economic performance for every state in the country, filling the void left by missing government data. To do this, the researcher combined two distinct types of information. First, they gathered the official, annual economic figures for the entire country of Nigeria. Second, they collected satellite images of the country's nighttime lights spanning nearly three decades, from 1992 to 2021. Using a sophisticated statistical method, they distributed the country's total economic output across the individual states based on how bright each state appeared in the satellite images. It was a process of matching the known total to the visible pattern of light, effectively using the glow of the night sky to reconstruct the economic map of the nation.

The results revealed a clear and evolving picture of Nigeria's economy. In the early 1990s, the economic map was dominated by the oil-rich coastal regions in the south, where the lights were brightest and the estimated economic output was highest. The rest of the country, particularly the northern and central areas, appeared much dimmer, reflecting a heavy reliance on oil exports and a lack of diversified industry. However, as the years passed, the pattern changed. By 2021, the light had spread. New pockets of economic brightness emerged in the southeast and northeast, and major urban hubs like Lagos and Kano grew significantly. The study showed that while the oil states remained powerful, the economy was slowly becoming more diverse, with trade, services, and industry spreading to other parts of the country. The satellite data successfully recreated the official national totals, proving that the method was sound, but it also highlighted where the light tells a different story than the economy actually is.

When the researchers compared their light-based estimates with the few official state-level numbers that the Nigerian government had released, they found both strong agreement and important differences. The method worked well for identifying which states were the richest and which were the poorest, generally matching the official rankings. However, the brightness of the lights did not always perfectly match the amount of money being made. In states where the economy relies heavily on farming, the lights underestimated the economic activity. This is because much of agricultural work happens during the day and does not require bright lights at night. Similarly, in states with large oil industries, the lights sometimes overestimated the economy. This happened because of gas flaring, a process where excess gas is burned off, creating a bright flame that looks like economic activity but does not always translate to the same level of local wealth. Conversely, some states with bright city centers but smaller economies were overestimated, as streetlights and public buildings added to the glow without necessarily reflecting a massive increase in production.

Beyond just mapping the current economy, the study used this new data to look at how the different states were growing over time. The researchers asked whether poorer states were catching up to richer ones, a concept known as convergence. They found that without any outside help, the gap between rich and poor states was closing, but very slowly. It would take nearly twenty-five years for the income gap to be cut in half if the current trends continued. This slow pace suggested that deep structural barriers, such as differences in infrastructure, education, and security, were keeping the poorer states from growing as fast as the richer ones. However, when the researchers accounted for these specific differences between the states, the picture changed dramatically. Once these structural factors were considered, the data suggested that the poorer states were actually catching up much faster, with the gap potentially halving in just over two years. This implies that if the right policies were put in place to fix the specific problems holding back certain regions, the country could see a rapid equalization of wealth.

The study concludes that satellite-recorded nighttime lights are a valuable and cost-effective tool for understanding the economy of Nigeria, but they are not a perfect replacement for official statistics. They provide a clear, real-time view of where economic activity is concentrated, making them ideal for spotting trends and identifying regions that need attention. However, they must be used with caution. The method works best for urban and industrial areas but struggles to capture the value of daytime farming or offshore oil production. The researcher recommends that Nigerian statistical agencies adopt this technology to complement their existing data, using it to track economic changes more frequently and to guide policy decisions. By combining the glow of the night with other indicators like agricultural output and energy use, policymakers could gain a much clearer and more accurate picture of the nation's economic health, ensuring that resources reach the places that need them most.