The impact of dialect distance on firm performance in underdeveloped counties: evidence from urban agglomerations

Why local speech matters for local business

People often think of accents and dialects as colorful quirks of everyday life, but this study shows they can also shape economic fortunes. By looking at thousands of factories in poorer counties inside China’s big city clusters, the authors ask a simple question: do firms do better when local people speak more similar dialects to those in nearby cities? Their answer suggests that shared ways of speaking can quietly support trust, trade, and growth in places struggling to catch up.

Looking at struggling places inside city regions

The research focuses on underdeveloped counties that sit inside larger urban agglomerations, where big cities and smaller towns are linked through roads, markets, and migration. These lagging counties are meant to benefit from the spillover of people, money, and ideas from nearby hubs, yet many still trail far behind. Instead of only counting highways or factories, the authors add culture to the picture, using how similar local dialects are as a yardstick for cultural closeness between these counties and the rest of their surrounding city region.

Measuring speech, profits, and their link

To explore this link, the team combines several large datasets. They assemble financial records for more than 33,000 industrial firms from 2012 to 2015 and match each firm to the county where it operates. They then draw on a detailed language atlas of China to rate how closely the county’s dialects resemble those in other counties inside the same urban cluster, weighting these scores by local population. With this, they estimate how changes in dialect similarity are related to firm profits while controlling for many other influences, such as firm size and age, local industry mix, income level, roads, internet use, climate, and even historical cultural sites.

What happens when dialects align

Across many versions of their statistical models, firms located in counties whose dialects are more similar to the rest of the urban region earn higher profits. This pattern remains when the authors strip out areas with multiple dialects or minority languages, add extra controls, and use a separate measure based on rugged terrain to address concerns that cause and effect might be reversed. The benefits of dialect similarity are strongest for older businesses and for privately owned firms, which rely more heavily on market ties than on state backing. The positive effect also grows in city regions with stronger internet access, more dominant core cities, and higher average incomes, where there is more economic activity to tap into.

How shared speech boosts business

The study then looks under the hood to see how this cultural closeness works. Firms in dialect-similar counties tend to sell more, turn over their inventories faster, and spend less on selling and financing. They also invest more in equipment and buildings and pay higher wages, suggesting gains in both capital and worker skills. These patterns point to several channels working at once: easier outreach to customers, lower marketing and loan costs, more willingness by outsiders to invest, and better movement and learning of workers across regions.

Culture and trust rather than just clear words

A key question is whether these gains arise merely because people understand each other more easily, or because they feel a deeper sense of belonging and trust. The authors test this by comparing regions where a standard national tongue is already widespread, and by checking whether improvements in transport or internet links weaken the role of dialects. They find that the positive impact of dialect similarity does not fade when basic communication becomes easier, suggesting that identity and trust, not just clear speech, are doing much of the work.

What it means for shared prosperity

In the end, the study argues that, for poorer areas trying to grow within large city regions, cultural closeness can be as important as concrete and fiber-optic cables. When people feel they share a local speech community with nearby cities, they may be more willing to trade, lend, invest, and share skills, all of which help local firms thrive. Rather than viewing dialects as obstacles to a national market, the authors suggest that nurturing cross-county cultural ties and trust networks can support more balanced growth and bring struggling counties closer to the prosperity of their urban neighbors.

Citation: Zhang, S., Li, Q., Wang, S. et al. The impact of dialect distance on firm performance in underdeveloped counties: evidence from urban agglomerations. Humanit Soc Sci Commun 13, 655 (2026). https://doi.org/10.1057/s41599-026-07022-4

Keywords: dialect similarity, firm performance, urban agglomerations, regional development, social trust