In consumer psychology, what is 'The IKEA Effect' that architects and designers often leverage in their client relationships?

In the realm of architecture and interior design, some retail brands have dramatically influenced how we think about spaces. IKEA has been particularly revolutionary, not just in furniture design but in changing how spaces are conceived and utilized. This trivia question explores a fascinating psychological phenomenon named after this influential Swedish company that has implications for architects and designers.

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People value products more highly when they've participated in their creation or assembly
The tendency for minimalist Scandinavian design to make spaces feel larger than they actually are
The psychological impact of walking through a predetermined path in retail spaces
The reduced perceived value of items that require self-assembly compared to pre-assembled alternatives