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In the realm of economics, the term *short-run* refers to a period during which at least one factor of production remains fixed. Typically, in a short-run adjustment, firms alter variable inputs like labor or raw materials, while fixed inputs, such as buildings and heavy machinery, remain unchanged.
This means businesses can react to changes in demand or supply but within the constraints of their existing production capacity. For example, hiring more workers or increasing the number of shifts are common short-run adjustments. These do not require time-consuming changes or expansions in physical capital.
Thus, while a company can increase its output quickly by adjusting variable inputs, the flexibility is limited by the capacity of its fixed inputs.

When we refer to a *long-run* adjustment in economics, we talk about a timeframe where all factors of production are variable. This allows firms to adjust not just labor or raw materials, but also to scale or modify their physical infrastructure.
Long-run adjustments involve significant changes, such as building new facilities or purchasing new machinery. These transformations require more time and financial investment, as they change the firm's production capacity. An example is a company building a new branch or expanding its manufacturing plant.
Such changes are often strategic and crucial for a firm seeking to cater to new markets or increase its market share.

The term *factors of production* encompasses the inputs used by firms to create goods and services. They are fundamental in understanding both short-run and long-run adjustments, as they dictate what can be changed and when:

• **Land**: Represents natural resources and the physical space for production.
• **Labor**: Involves human effort, including both physical and intellectual contributions.
• **Capital**: This includes physical machinery, buildings, and technology used in production.
• **Entrepreneurship**: The innovation and risk-taking needed to bring the other factors together efficiently.

In the short run, changes usually involve adjustments in variable factors like labor. However, in the long run, all factors, including physical capital, can be modified.

*Physical capital* refers to the tangible assets that a company uses to produce goods and services. This includes buildings, machinery, and technology. It is a crucial component of production that often dictates the ability of a company to expand its operations.
In the short run, physical capital is considered fixed due to the time and financial resources required to alter or expand it. This means while labor and materials can be adjusted quickly, buildings and machinery changes demand long-term planning and investment.
In the context of long-run adjustments, firms might build new facilities or upgrade equipment to enhance their production capacity, allowing them to increase overall output and efficiency. This is why physical capital is a significant consideration in understanding strategic economic planning.