Hi, friend. In fact, there is no perfect pricing model, as nothing happens in the way you imagine... For example, I tried to combine this three models listed on the site with the the best outsourcing pricing model in IT , however, nothing happened... Seriously, in fact you have to follow the single possible model that depends on your business. If it's long term cooperation - then Open Book pricing model is perfect for you. However, I guess that you can read the information from that site on yourself, and the information from that article matches the real life. I wish you good luck!
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