From an interview with the founder of Wordpress - "NVC - non violent communication". I didn't find a "best" book to describe the basically simple process though.
As far as problem solving specifically I enjoyed taking the CFA exams. Particularly L1 was good for looking a Financial problems.
1) Did you pay everything up front or was it a 50% up front and 50% on delivery basis?
2) Did you manage any deliverables on a google sheet (dates, owner etc) or something similar?
Have done some apartment renovations recently I find the same thing with architecture, architects.
Without a detailed plan a lot of space is wasted and the apartment ends up less nice and you often end up reconstructing stuff (if it is small and non standard).
The process takes 10-15% of the total cost of the project. Do people want to spend that? No.
More than 50% of the worlds population live in a countries with currency controls(China, India, Angola, Nigeria etc). They have reasons to avoid currency controls.
Another less nice example is the guy who had 50 million in BTC who went to german jail and they couldnt' recover the funds. This the first time in history you can have a "buried treasure" that you can protect just by memorizing 12 words.
Greece was almost in continual default from 1800 until the EURO. (Reinhart, Carmen M.; Rogoff, Kenneth. This Time Is Different).
Its only interesting when compared with the US. Japan put in instant payments in 1973. And Nigeria, Philippines and many other developing countriesall have local instant payment systems.
I have been using BRL (a stellar based stable token) to pay a programmer from Europe. Zero fee, Sepa instant to PIX. Allows me to pay him daily as that is what he wanted.
Here is an implementation https://github.com/lucidrains/titans-pytorch