The equation MV= GQ x [(P1 x Q1) + (Pl x Ql)] + OA is known as what model?

The equation MV= GQ x [(P1 x Q1) + (Pl x Ql)] + OA represents a hybrid model because it combines elements from different methodologies to estimate market value (MV). In this case, the model integrates aspects of sales comparison, income, and cost approaches in real estate valuation by factoring in both market data and adjustments for various inputs.

The term "hybrid" is appropriate here as it indicates the blending of various valuation methods—like the sales comparison approach (represented by the prices and quantities in the equation) alongside operational adjustments (OA)—to arrive at a more comprehensive estimate of market value. This approach allows for a more nuanced analysis by capturing different dimensions of value that might be overlooked in a strictly linear or additive model.

In contrast, linear, additive, and cost models each follow more singular or formulaic approaches without the integration of multiple methodologies that characterizes a hybrid model. This makes the hybrid model distinctive and particularly useful in complex valuation scenarios.