Tech giants like Apple and Google are now armed with $2 trillion in firepower for acquisitions — and

Dealmaking is off to a hot start in 2018, and it could continue thanks to the huge amount of cash available to public companies for transactions. Firepower for mergers and acquisitions has surged to more than $5 trillion in the past year, according to research by Citigroup. That's up from $3.3 trillion at the beginning of 2017. The large increase is partly attributable to the new tax law. Tech giants like Apple and Google have a disproportionate share of that dealmaking cash, though they've...