Presumably your brain reacts to the reminder that this is real money, and you tend to be more cautious. Or the lack of a reminder, fools you in to forgetting to total the cost.
“…customers given a menu without dollar signs spent significantly more than customers who had menus with dollar signs.”
http://lifehacker.com/menu-formatting-could-affect-how-much-you-spend-at-a-re-1607439738
* You Didn’t Understand The Problem You Were Solving
* You Asked Your Friends What They Thought
* You Listened To Users Instead Of Watching Them
* You Didn’t Test Your Riskiest Assumption
* You Had A “Bob The Builder” Mentality“…Sharon says it’s as simple as validating, or invalidating, three core pieces of the plan: The problem (Is the app solving a problem people care about?), the market (Are there enough people who have this problem?), and the product (Is our product solving this problem for this market?).
snippets of cloud 