The reason you prefer the option you can explain

Two laptops, one slightly better for the actual work and one with a specification that sounds like a decision. The second gets bought. Asked why, the buyer produces the reason — and the availability of that reason is what did the choosing, not the performance it describes.

What everyone sees

Explainability is treated as a by-product of a good decision: you chose well, so you can say why. The sequence often runs the other way. The requirement to produce an account arrives first, and options that cannot supply one are dropped before their merits are examined.

What is actually happening

Shafir, Simonson and Tversky argued that choice is frequently constructed by assembling reasons rather than by computing values, which explains preference patterns that violate standard models — including cases where adding an irrelevant option changes the winner because it changes which reasons are available. Simonson demonstrated the mechanism directly with compromise and attraction effects, finding that participants asked to justify their choices shifted further towards options with easily statable rationales. The load-bearing point is that reason availability is not evenly distributed across options. Attributes that are numerical, comparable and mentionable generate reasons; attributes that are diffuse, experiential or hard to name do not, so the latter lose systematically regardless of how much they matter.

Why it stays hidden

The substitution hides because the account produced afterwards is sincere. The buyer is not inventing a justification to conceal a whim; the reason genuinely participated in the decision. What is invisible is the filter applied earlier, in which unsayable considerations were quietly excluded from the comparison.