Merchandise can be arranged by which two methods?

Merchandise can indeed be effectively arranged by vendor or product collection. This method allows businesses to organize their inventory in a way that showcases products from the same brand or supplier together, facilitating a more cohesive shopping experience for customers. This strategy is particularly useful in merchandising, as it helps customers easily locate items from the same vendor, enhancing brand visibility and potentially increasing sales for those products. Arranging by product collection also allows retailers to create enticing displays that can attract customers' attention and encourage purchasing behaviors based on brand loyalty or product associations.

The other methods listed, while they can be beneficial in certain contexts, do not align as closely with effective merchandising practices aimed at improving customer experience and operational efficiency in a retail environment.