Elizabeth Warren is the senior senator from Massachusetts and a Democratic presidential candidate. The opinions expressed in this commentary are her own.

Chase Bank fired off a tweet last week staging a hypothetical conversation between one of its customers and her bank account. The customer asks why her account balance is low, and the bank tells her not to go out for food or coffee when she can make it at home instead, or to spend money on a cab when she can just walk. The customer pretends not to listen. "I guess we'll never know," she says, brushing off her low balance and the bank's "advice" on how to manage her money.

When I read that tweet, it hit me like a punch in the gut — but not for the reason Chase intended.

.@Chase: why aren't customers saving money?

Taxpayers: we lost our jobs/homes/savings but gave you a $25b bailout

Workers: employers don't pay living wages

Economists: rising costs + stagnant wages = 0 savings

Chase: guess we'll never know

Everyone: seriously?

#MoneyMotivation pic.twitter.com/WcboMr5MCE — Elizabeth Warren (@SenWarren) April 29, 2019

Here's the thing — I grew up on the ragged edge of the middle class in a family with a tight budget and no room for error. My parents worked hard and did the best they could, but when I was 12 years old, my Daddy had a heart attack. Everyone thought he was going to die. He came back home, but he couldn't work. There was no net to catch my family. We lost our station wagon and would have lost our house if my mother hadn't saved our family by going out and getting her very first job outside the home — a minimum wage job answering phones at Sears.

It wasn't until later in life that I realized how lucky my family was. After I became a law professor, I started studying what drives families into bankruptcy. I poured through records in courthouse after courthouse, and found that most of the families who ended up in front of a bankruptcy judge were just like mine. They worked hard and did everything right, scraping by until an unexpected medical bill or a divorce pushed them over the edge.

In the years since I started immersing myself in this topic, things have only gotten worse for working families. For 50 years, the price of housing, education and child care has skyrocketed while wages for most workers have barely budged . The economy has grown and workers' productivity has increased, but their share of corporate profits has fallen . The gap between incomes and costs is so gaping that 40% of Americans can't come up with $400 in an emergency. Hard-working families have become adept at stretching their paychecks to the breaking point, skimping on necessities just to make ends meet.