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IB DP Economics Study Notes

2.2.3 Non-Price Determinants of Supply

Supply in economics refers to the quantity of a product that producers are willing and able to offer for sale at different prices during a specific time period. While price is a significant factor influencing supply, there are other non-price determinants that can shift the supply curve. This section delves into three crucial non-price determinants: costs of production, technological advancements, and taxes and subsidies.

Costs of Production

The costs associated with producing a good or service can significantly influence the quantity supplied. When production costs rise, it becomes less profitable for firms to produce, leading to a decrease in supply. Conversely, a decrease in production costs can increase supply.

A graph illustrating the effect of changing production cost on supply

Image courtesy of outlier

Fixed Costs

These are costs that do not change with the level of production. They remain constant regardless of the quantity produced.

  • Examples: Rent for factory space, salaries of permanent staff, and insurance premiums.
  • Impact on Supply: While fixed costs don't change with production levels, a significant increase in fixed costs (like a sudden hike in rent) can deter new entrants in the market, potentially limiting supply in the long run.

Variable Costs

These costs change with the level of production. They fluctuate depending on the quantity of goods produced.

  • Examples: Costs of raw materials, hourly wages, and utility bills based on usage.
  • Impact on Supply: A rise in variable costs, such as an increase in the price of raw materials, can lead to a decrease in supply as it becomes less profitable for firms to produce. Conversely, a decrease in variable costs can lead to an increase in supply.

Marginal Cost

This represents the additional cost incurred by producing one more unit of a product.

  • Importance: Firms often base their production decisions on marginal costs. If the marginal cost is less than the market price, it's profitable to produce more.
  • Impact on Supply: A decrease in marginal costs, perhaps due to bulk purchasing discounts on raw materials, can lead to an increase in supply. To understand how supply responds to changes in production costs, reviewing the concept of Price Elasticity of Supply (PES) can offer further insights.
IB Economics Tutor Tip: Understanding how non-price determinants like technology and government policies affect supply is vital for analysing market dynamics and predicting shifts in production and availability of goods.

Technological Advancements

Technological progress can significantly influence the supply of goods and services. As firms adopt new technologies, they can produce more efficiently, leading to changes in supply.


Technological advancements often allow firms to produce more output using the same amount of inputs.

  • Impact on Supply: Increased efficiency means that firms can produce more at a lower cost, leading to an increase in supply.


New methods, machinery, or software can revolutionise production processes.

  • Examples: The introduction of assembly lines in car manufacturing or the use of AI in data analysis.
  • Impact on Supply: Innovative methods can drastically reduce production times and costs, leading to a surge in supply.


The use of machines and software to replace or assist human labour.

  • Examples: Robotic arms in factories or chatbots for customer service.
  • Impact on Supply: Automation can lead to consistent product quality and reduced production costs, increasing supply. The role of technology in shaping supply is also reflected in the broader context of Income Elasticity of Demand (YED), showing how consumer demand can adapt to changes in income and production capabilities.

Taxes and Subsidies

Governments often use taxes and subsidies as tools to influence the supply of certain goods and services in the market.


A financial charge imposed by the government on producers.

  • Specific Tax: A fixed amount of tax per unit of a good, e.g., a £1 tax on each bottle of alcohol.
  • Ad Valorem Tax: A tax based on the value of a good, usually expressed as a percentage of the price, e.g., a 20% tax on luxury cars.
  • Impact on Supply: Taxes increase the cost of production. As production becomes less profitable, there's a decrease in supply. The effects of Taxation on supply are critical for understanding how government policies can influence market dynamics.
IB Tutor Advice: When revising, create real-world examples for each non-price determinant of supply to solidify your understanding and apply these concepts effectively in your exam responses.


Financial support provided by the government to producers.

  • Direct Subsidy: A direct payment made to producers, e.g., a grant to farmers to encourage organic farming.
  • Indirect Subsidy: A reduction in taxes or provision of services that support production, e.g., subsidised training for workers.
  • Impact on Supply: Subsidies reduce the cost of production. By making production more profitable, they lead to an increase in supply. The impact of Subsidies is a crucial area of study for understanding government intervention in markets.

Understanding these non-price determinants is essential for students. It offers insights into how various factors, beyond just price, influence the supply of goods and services in the market. This knowledge is crucial for predicting market outcomes and for understanding the broader economic landscape. Additionally, exploring the Non-Price Determinants of Demand can provide a comprehensive view of how both supply and demand factors interact within the economy.

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A summary table of the determinants of supply.


Yes, subsidies can lead to overproduction in a market. When the government provides financial support to producers, it reduces their cost of production. This makes it more profitable for firms to produce, often leading to an increase in the quantity supplied. However, if the subsidy is too generous or not well-targeted, it can result in firms producing more than what's socially optimal or what consumers demand at a given price. This overproduction can lead to wastage of resources, distort market outcomes, and potentially result in surpluses that might depress market prices.

Excise duties are specific taxes levied on the production, sale, or consumption of a particular good, usually charged as a fixed amount per unit. In contrast, ad valorem taxes are based on the value of a good, typically expressed as a percentage of the price. The impact on supply can vary. Excise duties increase the production cost by a fixed amount per unit, regardless of the product's price. This can lead to a parallel leftward shift in the supply curve. Ad valorem taxes, however, increase with the product's price, making them more burdensome for higher-priced goods. This can lead to a non-parallel, or more elastic, shift in the supply curve, especially for luxury items.

Research and development (R&D) is a critical driver of technological advancements in production. Through R&D, firms invest in creating new products, refining existing products, or developing more efficient production processes. This investment often leads to innovations that can revolutionise the way goods are produced. For instance, R&D might lead to the discovery of a new material that's cheaper and more durable or a new software that speeds up the manufacturing process. As firms implement these innovations, they can achieve higher levels of efficiency and productivity, leading to increased supply in the market.

Economies of scale refer to the cost advantages that firms experience when they increase their level of production. As a firm expands its production, the average cost per unit often decreases. This phenomenon can be attributed to factors such as bulk buying of raw materials, more efficient use of production techniques, and the spreading of fixed costs over a larger number of units. In the context of the costs of production, economies of scale can lead to a significant reduction in average costs, making production more profitable. As a result, firms that achieve economies of scale can potentially supply more goods to the market at competitive prices.

Indirect costs, also known as overheads, are expenses that are not directly tied to a specific product but are spread across multiple products or services. Examples include utilities, rent, administrative salaries, and general office supplies. These costs play a vital role in the overall costs of production. While they might not vary with each unit of product, they are essential for the functioning of a business. When calculating the total cost of production, both direct costs (like raw materials) and indirect costs are considered. A significant increase in indirect costs can raise the overall cost of production, potentially leading to a decrease in supply if firms find it less profitable to produce.

Practice Questions

Explain how technological advancements can influence the supply of a product in the market.

Technological advancements play a pivotal role in influencing the supply of products in the market. As firms adopt cutting-edge technologies, they often experience enhanced efficiency, allowing them to produce more output using the same amount of inputs. This increase in productivity can lead to a reduction in production costs. Moreover, innovations, such as the introduction of new machinery or software, can revolutionise production processes, making them quicker and more cost-effective. Automation, another facet of technological progress, can replace or augment human labour, further reducing costs and ensuring consistent product quality. Consequently, these technological improvements generally lead to an increase in supply as production becomes more profitable for firms.

Discuss the impact of subsidies on the supply of goods in a market.

Subsidies are financial aids provided by the government to producers, and they have a profound impact on the supply of goods in a market. By directly reducing the cost of production, subsidies make it more profitable for firms to produce. For instance, a direct subsidy, such as a grant to farmers, can encourage them to produce more of a particular crop. Indirect subsidies, like reduced taxes or subsidised training for workers, can also lower production costs. As a result, the supply curve shifts to the right, indicating an increase in supply at every price level. In essence, subsidies act as an incentive for producers to offer more goods in the market, thereby increasing supply.

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Written by: Dave
Cambridge University - BA Hons Economics

Dave is a Cambridge Economics graduate with over 8 years of tutoring expertise in Economics & Business Studies. He crafts resources for A-Level, IB, & GCSE and excels at enhancing students' understanding & confidence in these subjects.

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