Basic economic principles:

Scarcity means we don't have enough resources to satisfy everyone's wants and needs. In agriculture, this is very real. Farmers have limited land, water, seeds, and money, yet they must produce food for millions of people. Because these resources are finite, farmers must make tough choices about what to grow and how to use their land.

Think about a Nigerian farmer with just two hectares. Should he plant cassava for food or cocoa for export income? He cannot do both equally well with his limited space. During dry seasons, water becomes scarce too, forcing farmers to choose which crops get irrigation. Even government agricultural extension agents are limited in number, so not every farmer gets the same level of support.

Understanding scarcity helps explain why food prices rise, why farmers cannot meet all market demands, and why agricultural development requires careful planning.

Choice means deciding between different options because we cannot have everything we want. In agriculture, choice happens every day. A farmer with limited money must decide whether to buy fertilizer, improved seeds, or pesticides. You cannot buy all three if your money is small, so you must choose what matters most.

Nigeria's situation makes this clear. A cocoa farmer in Ondo State might choose between expanding the farm, buying a better pesticide sprayer, or investing in a storage facility. The choice depends on what will give the best results. This is why understanding choice is crucial in agriculture—resources like land, money, and labour are limited everywhere.

When farmers make smart choices, they increase productivity. When they choose poorly, they waste resources and reduce profit.

Scale of preference refers to the order in which you rank your wants based on their importance to you. Since resources are limited, you must decide which needs matter most. Think of it like this: when you have limited money, you decide whether to buy books for school, food, or new clothes first.

In Nigerian agriculture, a farmer with limited money must choose between buying improved seeds, fertilizer, or hiring labour. Most farmers rank buying seeds first because good seeds directly increase harvest. Fertilizer comes second, and hiring workers comes third. This ranking depends on each farmer's situation and what will give the best returns.

Everyone has a different scale of preference based on their circumstances. Your personal scale helps you make smart decisions about resource use, which is crucial for farm management and business success.

The law of diminishing returns states that when you keep adding more of one input while keeping others constant, your total output will eventually increase at a slower rate. Eventually, it might even decrease.

Picture a farmer with one hectare of land. Adding one extra worker increases harvest significantly. The second worker also helps considerably. However, the tenth worker adds very little because the land is now overcrowded—workers get in each other's way and there's limited space to work. The land hasn't changed, but the extra workers contribute less and less to production.

This principle applies everywhere in Nigerian agriculture. If you use more and more fertilizer on your cassava farm without increasing land or improving other practices, production will plateau. Beyond a certain point, excess fertilizer burns the soil and reduces yield.

Understanding this concept helps farmers make smart decisions about spending money on inputs.