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Method 1 for Adjusting Price Differences of Building Materials I. Causes and Factors Behind Price Differences in Construction Materials In the era of a planned economy, all major materials were subject to unified pricing and controlled distribution, while other materials were managed by relevant departments. **A unified price standard is implemented; there is a consistent method for calculating costs in construction projects, ensuring stable and sustained prices, as well as accurate and unchanging estimates of project costs. “Under the \"dual-control\" pricing system, guided by **mandated prices** and various factors, the prices of some materials begin to be determined by market forces, resulting in price fluctuations. However, the three major building materials (steel, timber, and cement) remain subject to **maximum price limits**, and price differences for these materials become apparent in project settlements. Today, under market economy conditions, adjustments to material price differences become even more prominent. As is well known, the determination of current project costs involves calculating the volume of work in accordance with the rules set for quota calculations; the direct costs of a project are then determined by multiplying this volume of work by the base prices of the corresponding quota items. The base price of a scheduled item (i.e., the budgeted price) consists of labor, materials, machinery, and other direct costs. In construction projects, if the direct costs of the project are taken as 100%, then labor costs account for 20% of these direct costs, materials account for around 70%–75%, and machinery costs account for about 5%. Therefore, the level of material prices will directly determine the level of construction costs. In fact, the prices used in actual construction do not remain constant; especially under a market economy system, various building materials are subject to frequent fluctuations as a result of changes in **policy adjustments, regional differences, time factors, and supply and demand conditions. Whether prices rise or fall, these fluctuations are ongoing and inevitable, and they are not determined by human will. The main factors contributing to price differences in materials are as follows: 1. **Policy factors.** **Changes in policies and regulations will have a significant impact on the market. This change in material prices resulting from changes in the system is known as “systemic difference.” For example: during the 1998–1999 period, **interest rates on deposits and loans were reduced repeatedly; in the 1993–1995 period, a series of measures were taken to curb excessive economic growth.** 2. Regional factors. The difference between the material budget price in the location where the budget quota valuation table is prepared and the material prices in other regions where the same quota is applied during the same period is known as the \"regional price difference\". 3. Time factor. The difference between the budgeted price of materials for a given year as determined in the fixed-amount valuation table and the actual price of those materials during the year in which the project is carried out is known as the “time difference”. 4. Supply and demand factors. That is, the price difference resulting from changes in market prices of materials purchased from the market due to changes in the production, supply, and sales systems is what is referred to as the “potential difference.” 5. Local department document factors. The price difference resulting from changes in the prices of certain materials due to adjustments in local industrial structures is known as the “local difference.” Changes in the prices of building materials result in different market prices. In engineering practice, construction companies obtain the raw materials needed for building products directly from this volatile market, and the products resulting from this process are shaped by dynamic prices. Dynamic prices require corresponding dynamic management; only in this way can the interests of both the ** and the project owners be safeguarded, while also protecting the legitimate rights and interests of construction companies, thereby ensuring that construction projects progress in a planned, orderly, and sustainable manner. II. Adjustment of price differences for construction project materials In practice, the following methods are commonly used to adjust the price differences of materials in construction projects. 1. Actual adjustment method (i.e., sampling adjustment method) This method involves using the actual purchase price of materials at the location of the construction project (as determined by both parties A and B), and then making adjustments based on the corresponding budgeted prices and specified quantities for those materials in order to calculate the price difference. Calculate using the following formula: The price difference for a particular material = the actual price of that material (or its weighted average price) – the price of that material specified in the budget. Note: To determine the actual price of construction materials: ① Refer to the prices of all materials regularly published by the local cost management authorities; ② Use the actual prices provided by the material suppliers, as designated by the project owner or purchased by the construction unit with the owner’s approval. The weighted average price of a particular material = ΣXi×Ji÷ΣXi (where i ranges from 1 to n). Here, Xi represents the quantity of the material purchased from different sources, and Ji represents the price of the material from each source. The adjustment amount for the price of a particular material = the total amount of that material used in the project × the price difference per unit of the material. The advantage of making adjustments based on actual prices is that it ensures accurate, reasonable adjustments that are grounded in reality. Given that construction materials come in a wide variety of types, are available through numerous channels, come in various specifications, and are produced in large quantities, using random sampling for price adjustment would be time-consuming, labor-intensive, and complicated. 2. Comprehensive coefficient adjustment method: This method involves using the comprehensive adjustment coefficients determined by the local construction cost management authorities to adjust the price differences of construction materials. The calculation formula is as follows: Adjustment coefficient for a certain material = Σ × K1 (price differences of various materials) × K2. Here, K1 represents the proportion of the cost of various materials in the total cost of construction materials, while K2 represents the proportion of each type of construction material in the direct costs. The amount by which the price of construction materials needs to be adjusted for a particular project = Comprehensive adjustment coefficient × Direct costs specified in the budget quota. The advantage of this method is its simplicity and speed in implementation. However, this method relies too heavily on the cost management department’s work in measuring the comprehensive coefficients. In practice, errors in the calculation of project costs often arise due to the representativeness of the selected projects, the authenticity and accuracy of material prices, as well as short-term price fluctuations. 3. A combination of actual adjustment and comprehensive coefficients. According to statistics, the value of the three main types of materials accounts for around 68% of the total material costs, while the numerous local materials and other types of materials together account for only 32% of these costs. In fact, it is not necessary to conduct a comprehensive measurement of all the materials that are widely used in various sub-items. In some cases, based on the A, B, C classification principle of mathematical statistics, by focusing on the main issues, materials of category A are subject to strict control, while those of categories B and C are handled to a lesser extent. That is, adjustments are made to the quantities of the three types of materials or the main materials (i.e., those of category A), and the other materials (i.e., those of categories B and C) are adjusted using supplementary coefficients. This approach overcomes the shortcomings of the previous two methods, improves the accuracy of project cost estimates, and frees budget preparers from tedious tasks. 4. Price index adjustment method: It is a method of adjusting the price differences of construction materials one by one, based on the prices of building materials or price difference indices published by the local construction cost management authorities for the current period. This method falls under the category of sampling-based compensation; it involves substantial computational effort and complexity, often requiring cost management departments to invest a lot of manpower and time. The specific approach is to first estimate the budget prices and market prices of various building materials in the area, and then compile and regularly publish price indices and price difference indices for these materials. The calculation formula is as follows: The price index of a certain material = the budgeted price of that material for the current period ÷ the designated price in the standards for that material. The price difference index of a certain material = the price index of that material – 1. The advantage of this price index adjustment method is that it enables timely reflection of changes in building material prices, offers high accuracy, and is suitable for dynamic management in construction projects. The above four methods for adjusting differences are frequently encountered in practical work, which requires budget preparers to master and apply them skillfully. In actual work, no matter where one is working or from which location data is collected, it is necessary to quickly understand, adapt to, and become familiar with the local standards and methods, and to ensure that there are rules to follow and evidence upon which to rely.