Apple announced during its earnings release on Wednesday that it was sitting on $151 billion in cash, but it's certainly not the only company stockpiling money.
"There are very high levels of potential income investment sitting on the sidelines," said Jared Bernstein, former chief economist to Vice President Joe Biden and a CNBC contributor.
Estimates of cash hoarding by corporations vary from $1.5 trillion to upward of $5 trillion. That's money that some say could be put to better use like giving back to shareholders, creating jobs and stimulating the economy.
"If we lowered the corporate tax rate ... we would see more repatriation of those earnings," economist Diana Furchtgott-Roth told CNBC's "Street Signs."