Excel only adds up to about 6 decimals. I worked on a project of an Endowment Fund (billions) and Excel was flat out wrong when computing billions over decades.

Excel only adds up to about 6 decimals. I worked on a project of an Endowment Fund (billions) and Excel was flat out wrong when computing billions over decades. The worst part is: Excel is the Dogma. If your results do not match with Excel, make it.