^^I was thinking with the perspective of what will benefit the motorist the most. I feel like establishments here reserve parking spaces for their customers too much. Doesn't make sense to me since they could charge parking fees if they want to, ultimately benefiting them still...
For on-street parking, check out
The High Cost of Free Parking by Donald Shoup. You don't even need to buy the book; there's enough information online about the concepts in the book. Basically, on-street parking is a valuable public good, and in areas of high demand, it should be managed wisely. in busy neighborhoods, on-street parking rates should be high enough to leave 15% to 20% of space vacant. Rates should be lower further away from high demand locations, but still high enough to have some vacant spaces, so drivers don't add to traffic congestion by cruising for parking. Revenue from on-street parking should be directed to visible streetscape improvements, so parkng fees don't feel like a tax or money grab.
For off-street parking, zoning codes (outside of denser cities) in most of the US, Canada, and other countries with a lower density suburban built environment (Australia, New Zealand, South Africa, Iceland, etc.) require uses to have a certain minimum number of parking spaces, depending on some attribute like gross floor area, bedrooms in a house, number of seats in a restaurant, and so on. The requirements are usually based on worse-case scenarios, like Black Friday shopping. The rest of the year, the bulk of those parking spaces sit empty. The result: land not being put to its "highest and best use", less potential property tex revenue for municipalities, increased urban sprawl (and other associated costs, like the cost of building and maintaining roads, water and storm/sanitary sewer infrastructure), from consuming more land, increased stormwater runoff (and even more space consumed by utilitarian on-site "stormwater management practices" like retention and detention ponds), and increased urban heat island effect. There's also a fear of spillover parking from uses and buildings that don't have enough parking to meet demand. Planners in North America have been reconsidering the idea of minimum parking requirements over the past couple of decades.