Why do you think Capitalism has meritocracy as a core component?
Capitalism is a system where capital needs to be converted into more capital via economic action (reinvestment) rather than just sat upon.
Capital will always find ways to grow, if there are laws - they will be lobbied against. Or those with main market share will work together to stabilise the market and squash competition.
The better product; the greater amount of production; the higher efficiency
Every economic system claims to be able to deliver those goals.
But what you’re describing is more a general free-market economy than capitalism proper. The former determines how companies interact with consumers and each other; the later determines how power and profits are distributed within a company.
I haven’t yet expressed an opinion on capitalism, except to say that the features you’ve mentioned have little to do with it.
But to answer your original question: capitalism stricto sensu is when the profits and decision-making power in a firm are vested in those who put up the original financial capital. It incentivizes financial risk-taking, which (depending on economic conditions) can be useful or destructive. But the only merits it rewards are the possession of pre-existing wealth, the willingness to take risks with it, and luck. Nepotism and cronyism serve its ends by providing a source of wealth for new capitalists, and an outlet for successful capitalists to convert their gains into social rewards.
That's the thing, merit can be defined however we want be any value system.
One could define it as any of the things you said. I can define it as bringing happiness or health as easily as boosting profit, and if I wanted to facetiously make a point I could define it as strength or even "being closely related to previous leaders".
What is deemed as merit is itself a statement of what has highest value under that system.
Under Capitalism the merit that's rewarded, in my eyes, is the ability to make money.
I personally, would rather a system that places ability to support peace and raise quality of life as the merit that is rewarded.