There is no such a thing that you say you can't pay with money or assets or work then you simply just don't pay well then you go to war.
Countries who got high debt level definately will get involved in wars more.
Debt Will be settled by fighting, nothing really changed from old roman times or accient slave and rulers times our world leaders have the same old mentality they just know how to hide it.
Switzerland are neutral country all the world leaders got their directions from there its a bankers center off course nobody don't talk about this where the true bankers organise all those wars they even keep their old ancesasters pharonic tradions BIS is located aswell there wich directs all the other banks.
Sounds good, but it would be ideal if we take the last 100 years as an example, list all the wars, identify those who started the war, and evaluate the state of their economy. That would be very open and reasoned. I assume you must have data on which you based your theory ?
I would be very grateful for the publication of such data, it will be interesting to analyze each case to answer - to what extent your theory is correct.