Explanation:

- Short-period: This is a time where supply can only partially adjust to changes in demand, usually due to constraints in production capacity or short-term planning.

- Very short-period: Supply is not adjusted to demand changes. This period captures scenarios like immediate or overnight scenarios, where no significant adjustments can be made.

- Mid-period: Refers to an intermediate timeframe, which isn't commonly used in economic theory. It's usually less defined in academic discussions.

- Long-period: This is when supply is fully adjusted to changes in demand. Firms can adjust all inputs, production capacity, and workforce size to meet demand.