Your mom and dad, or grandparents probably didn't need to know, even though they know how.
Most of their interactions were with local businesses, with people who, like themselves, were part of the local community. The unofficial grapevine worked pretty well for rooting out the good and bad mechanics, lawyers and florists. Your dad could change the oil, but almost certainly knew which mechanics could be trusted to have done what was on the invoice, and the few to avoid at all costs. Mostly if really was OK not to care, because they knew someone who did. The network meant something. Doubly so in smaller towns, and yes, small town life came with some downsides too. :)
That breaks horribly when recommendations are of global mega-multinationals, and most businesses on most high streets are national and international chains. A recommendation counts for nothing for a business of that scale, and an individual vote may be an employee you might never encounter again. The network means nothing, except as something to be gamed. Taking your custom elsewhere means nothing unless a million or two others do too. You have to care as no one else gives a shit about your interests, just the sale or commission. Except precisely none of us have the time for that.
If we want the benefits of larger scale business I think we need to start giving them some responsibilities too. Like a duty of care in law as exists in some areas already, but further reaching to consider the public interest as a priority. Without something the power imbalance is impossible.
Without constraint, large business takes the piss. It's time for some constraint. Then maybe we actually can depend on each other again.