Looking for biz ideas? :) In one place where I worked, someone had programmed financial models in Excel. It used to run for a long time, crash often etc. But

Looking for biz ideas? :) In one place where I worked, someone had programmed financial models in Excel. It used to run for a long time, crash often etc. But it was good enough for his team and they used it until I left. That one single Excel file was worth a lot