The following data is given for the Zoyza Company: 
Overhead is applied on standard labor hours.
The factory overhead volume variance is:
Definitions:
Monopolistic Competition
A market structure characterized by many firms selling products that are similar but not identical, allowing for significant degrees of market power and product differentiation.
Oligopoly
A market structure characterized by a small number of firms which dominate the market, leading to limited competition and often high prices.
Four-firm Concentration Ratio
A measure that expresses the total market share held by the four largest firms within an industry.
Herfindahl Index
A calculation of how concentrated a market is, achieved by adding together the market share squares of every firm within that industry.
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