Stone powder and sand are more expensive in regions with high demand, limited supply, and strict environmental regulations. For instance, in California, USA, stone powder and sand prices are significantly higher due to the state's stringent environmental laws and the high demand for construction materials. According to the U.S. Geological Survey, the cost of sand and gravel in California is approximately 20% to 30% higher than the national average. This is primarily due to the state's strict regulations on mining and land use, which limit the availability of these materials. Additionally, the high demand for construction in California, driven by population growth and urban development, further contributes to the elevated prices.