Unstable factors that may increase due to large-scale immigration caused by large-scale engineering construction should be calculated as () cost in the life cycle cost analysis of the project.

This topic studies the project life cycle cost analysis. Environmental costs and social costs (such as large-scale migration caused by engineering construction, which may increase social instability) are hidden costs and are not directly manifested as quantitative costs. Subjectively, we attach great importance to the financial effect of the project itself, but pay insufficient attention to the external effects such as the environment and society of the project. Although the national economic evaluation of the project also does external effect evaluation, it is often a mere formality; Objectively, because the environmental and social costs are difficult to measure, it also affects its position in practice. Considering various factors, this book mainly considers the economic cost of the project life cycle.