Zelle allows customers to make free instant payments between individual bank accounts. Photo: Tiffany Hagler-Geard/Bloomberg News JPMorgan Chase said some of its banking customers who use the payment app Zelle had their checking accounts mistakenly charged twice.

Democratic lawmakers in Connecticut introduced legislation Thursday that would create a public option for health-care coverage, allowing individuals and small businesses to buy insurance through the state. Under the proposal, Connecticut would create multiple plans that small businesses and their employees could buy starting in July, leveraging the state’s existing purchasing power to lower costs. And in 2021 Connecticut would begin offering a new health-insurance option that any state...