Total factor productivity (TFP) is a comprehensive measure of efficiency that considers all inputs used in production, including labor, capital, and technology. It reflects how effectively an economy or firm utilizes its resources to generate output. Unlike partial productivity, which looks at one input, TFP provides a holistic view of the production process efficiency.

The experience curve (or learning curve) illustrates the phenomenon where the unit cost of production decreases by a fixed percentage each time cumulative production volume doubles. This reduction is driven by improvements in operational efficiency, worker learning, and technological advancements over time. It is a vital tool for long-term strategic planning, pricing decisions, and evaluating the competitive advantage gained through cumulative production experience.

Price discrimination is a microeconomic pricing strategy where identical or largely similar goods or services are sold at different prices by the same provider in different markets. This practice allows businesses to maximize revenue by capturing consumer surplus from different segments of the market based on their willingness to pay, rather than differences in the cost of production or service delivery.

Demand inelasticity occurs when the percentage change in quantity demanded is less than the percentage change in price. This means consumers are not very sensitive to price changes for that specific product. This is often observed in essential goods or products with few substitutes, where consumers continue to purchase the item regardless of price increases.

A downward demand spiral occurs in a competitive market when a firm's price reduction fails to capture sufficient market share or when consumers perceive the price drop as a signal of declining quality. If competitors do not match the price decrease, the firm may lose volume or face negative brand perception, leading to a contraction in demand. This phenomenon highlights the risks associated with aggressive price-cutting strategies in highly competitive environments.

Supply and demand are influenced by a variety of market forces. Customers drive demand through their purchasing behavior, while costs dictate the feasibility of supply. Competitors influence both supply and demand by offering alternatives and changing market prices. Consequently, all these elements are integral to understanding market dynamics.

Non-value added costs are expenses that do not contribute to the product's or service's value as perceived by customers. Eliminating these costs does not reduce the market offering's usefulness. Examples include unnecessary processes, waiting times, or inefficiencies. Identifying and removing these costs is a primary goal of lean management and cost control strategies.

The variable overhead efficiency variance is calculated as the difference between the actual quantity of the cost allocation base used and the budgeted quantity allowed for the actual output. Here, $48,000 - $28,000 equals $20,000, representing the variance in resource usage efficiency.

The variable overhead spending variance measures the difference between the actual variable overhead costs incurred and the flexible budget amount for variable overheads. It specifically isolates the impact of price changes or efficiency in spending on variable overhead resources during the period.

The price variance is defined as the difference between the actual price paid for an input and the standard or budgeted price for that input. In this case, the calculation is $70 (Actual) - $40 (Budgeted) = $30. This indicates an unfavorable variance because the actual price paid exceeded the budgeted price.