IKEA Effect (Why do we judge things that we helped create as having higher value than things we did not create?)
The IKEA effect, a brief explanation
What is the IKEA Effect?
The IKEA effect is the tendency to value things that we helped create as being more valuable than things we did not help create.

Examples
When we purchase a flat-packed piece of furniture and assemble it we often estimate its value to be greater than furniture we did not assemble.
If you were to bake a cake you may value it more than a similar cake purchased in a store.
The literature
Norton, M. I., Mochon, D. & Ariely, D. (2012). The IKEA effect: when labor leads to love. Journal of Consumer Psychology, 22(3), 453-460. Doi: 10.1016/j.jcps.2011.08.002
Radtke, T., Liszewska, N., Horodyska, K., Boberska, M., Schenkel, K. & Luszczynska, A. (2019). Cooking together: the IKEA effect on family vegetable intake. British Journal of Health Psychology, 24(4), 896-912. Doi: 10.1111/bjhp.12385