Other companies are using Sankey diagrams to show cash flows over time, which has particularly caught on with young budgeters. Monarch , a budgeting-software company, actually advertises its use of Sankey diagrams on social media. “It’s our No. 1 marketing tool,” said Rachel Lawrence, who is head of advice at Monarch and runs her own financial-planning company based in New Hampshire.“The Sankey helps to note the various income sources at this point of retirement, and the values across Social Security, annui ...