Lesson Notes By Weeks and Term v4 - SHS 2

Lesson Video

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Performance objectives

• Identify factors that influence demand for agricultural goods.
• Identify factors that influence the supply of agricultural goods.
• Analyze how changes in demand and supply affect prices.

Lesson summary

Welcome, students. Have you ever wondered why the price of plantain is low during the rainy season but very high in the dry season? Or why the cost of chicken increases so much around Christmas? These price changes are not random; they are caused by two powerful economic forces: demand and supply. Understanding these forces is crucial for anyone involved in agriculture, from the farmer in the village to the minister in Accra, and even for us as consumers. In this lesson, we will explore the specific factors that push the demand for and supply of agricultural goods up or down, helping us understand the prices we see in the market every day.

Lesson notes

This section breaks down the core ideas you need to master. We will go step-by-step. A. Fundamental Definitions Commodity: An agricultural product that is bought and sold, like maize, cocoa, cassava, or tilapia. Demand: This refers to the quantity of a commodity that consumers are willing and able to buy at a given price over a specific period. The key words here are "willing" (they want it) and "able" (they have the money for it). The Law of Demand: This is a simple but powerful rule: *Ceteris paribus* (all other things being equal), as the price of a commodity falls, the quantity demanded rises. Conversely, as the price of a commodity rises, the quantity demanded falls. Think about it: you are more likely to buy more mangoes when they are cheap. Supply: This refers to the quantity of a commodity that producers (farmers) are willing and able to offer for sale at a given price over a specific period. The Law of Supply: *Ceteris paribus*, as the price of a commodity rises, the quantity supplied by producers also rises. Conversely, as the price falls, the quantity supplied falls. A farmer is more motivated to grow and sell more maize when the price is high than when it is low. B. Factors Influencing Demand for Agricultural Commodities

These are factors that can cause the *entire* demand for a product to increase or decrease, even if the price stays the same. This is called a shift in the demand curve. Price of Related Goods: Substitutes: These are goods that can be used in place of each other. If the price of a substitute good increases, the demand for our commodity will increase. Example: If the price of fish (tilapia) becomes very high, many families in Ghana will switch to buying chicken. Therefore, a high price for fish will *increase the demand* for chicken. Other examples: Yam and Cassava; Milo and Richoco. Complements: These are goods that are often used together. If the price of a complementary good increases, the demand for our commodity will decrease. Example: Bread and margarine are often consumed together. If the price of bread skyrockets, people will buy less bread, and consequently, they will also buy less margarine. Therefore, a high price for bread *decreases the demand* for margarine. Income of Consumers: Normal Goods: For most agricultural products, as consumer income increases, the demand for these goods also increases. People can afford to buy more or better-quality food. Example: As a person's salary increases, they are likely to move from buying mainly gari and beans to buying more chicken, meat, and fresh fruits. Inferior Goods: For a few goods, as income increases, demand actually falls because people switch to more desirable alternatives. Example: A very low-income family might rely heavily on gari. If their income increases significantly, they might reduce their consumption of gari and buy more rice or yam, making gari an inferior good in this context. Consumer Tastes and Preferences: People's choices, influenced by culture, health trends, advertising, and religion, have a huge impact on demand. Example: Recently, there has been a health campaign in Ghana about the benefits of eating local vegetables like *kontomire* and fruits like pineapple. This campaign can *increase the demand* for these items, even if their prices don't change. Population and Demographics: A simple rule: more people mean more mouths to feed. An increase in population generally leads to an increase in demand for food. Example: The rapid growth of cities like Accra and Kumasi has significantly *increased the demand* for basic foodstuffs like rice, maize, and vegetables in those urban centres. Expectations of Future Prices: If consumers expect the price of a commodity to rise sharply in the future, they may buy more of it now to stock up. Example: If there are rumours that a shortage of onions is coming next month due to problems in Burkina Faso, many households and restaurant owners will rush to buy more onions today. This *increases the current demand* for onions. Festivals and Seasons: Cultural and religious events drastically affect demand. Example: During Christmas and Easter, the demand for chicken, goat, and rice increases dramatically in Ghana. Similarly, the demand for yams increases during the Homowo festival for the Ga people. C. Factors Influencing Supply of Agricultural Commodities

These factors cause the *entire* supply of a product to increase or decrease. This is called a shift in the supply curve. Cost of Production (Input Prices): If the cost of inputs like fertilizer, seeds, labour, or fuel for tractors increases, it becomes more expensive for the farmer to produce. This will lead to a decrease in supply. Example: If the government removes subsidies and the price of fertilizer triples, a maize farmer may decide to cultivate a smaller portion of their land or use less fertilizer, leading to a smaller harvest. This *decreases the supply* of maize. Technology: Improvements in technology, such as new high-yielding crop varieties, better irrigation methods, or more efficient farm machinery, make production cheaper and more effective. This increases supply. Example: The introduction of a new cocoa variety by COCOBOD that is resistant to the swollen shoot disease will allow farmers to harvest more cocoa from the same piece of land. This *increases the supply* of cocoa beans. Climatic Conditions / Weather: Agriculture is heavily dependent on the weather. Favourable weather (good rainfall, adequate sunshine) leads to bumper harvests and increases supply. Unfavourable weather (drought, floods) destroys crops and reduces supply. Example: A prolonged drought in the northern regions of Ghana will lead to a very poor maize and yam harvest, drastically *decreasing the supply* of these commodities in the market. Government Policies: Subsidies: If the government provides subsidies (e.g., Planting for Food and Jobs), it lowers the cost of production for farmers, encouraging them to produce more. This *increases supply*. Taxes: If the government imposes taxes on agricultural inputs or produce, it increases the cost of production, which can *decrease supply*. Price of Other Commodities (Alternative Products): A farmer often has a choice of what to grow on their land. They will likely choose the crop that gives them the most profit. Example: If the market price for soybeans becomes much higher than the price for maize, many farmers who previously grew maize may switch to cultivating soybeans the following season. This would *decrease the supply of maize* but increase the supply of soybeans. Pests and Diseases: An outbreak of a major pest (like Fall Armyworm) or a disease can devastate crops or livestock, leading to a sharp decrease in supply. Example: An outbreak of Avian Influenza (Bird Flu) forces poultry farmers to destroy their flocks, leading to a massive *decrease in the supply* of chicken and eggs in the market. D. Important Distinction: A Change in Quantity vs. A Change in the Curve Change in QUANTITY Demanded/Supplied: This is a movement along the curve. It is caused ONLY by a change in the price of the product itself. *Example:* If the price of tomatoes drops from GH₵5 to GH₵3 per bowl, people buy more tomatoes. This is a change in *quantity demanded*. Change in DEMAND/SUPPLY: This is a shift of the entire curve to the left (decrease) or right (increase). It is caused by any of the other factors we just discussed (e.g., income, weather, technology). *Example:* A new health report says tomatoes prevent cancer. Many more people want to buy tomatoes, regardless of the current price. The whole demand curve shifts to the right. This is a change in *demand*.

Guided Practice (With Solutions)

Evaluation guide

• Discuss the f actors that influence demand and supply of Agricultural
• commodity.
• Inquiry -based learning:
• Learners in a mixed -gender group surf the internet for information on the