> and is commonly done in Imperial/American standard units in some fields (e.g. kPSI or MPSI for large units of pressure)

Fields, as in scientific fields? Are there any that still commonly use imperial units at all?

> Liter isn't an SI unit simply because it's not the base unit of volume. Volume is inherently just built on distance measurements, and the SI system already has the meter, ergo the base unit of volume is the cubic meter.

Most SI units are not base units, for example the microsecond and the newton. SI just defines a list of units whose use is recommended, and they happened to decide that litre is not one of them. Other than the prefixes, they try and have just one unit for each kind of quantity. However, they include the litre in a list of non-SI units whose use is acceptable, along with the likes of minutes, degrees, hectares, and electronvolts.

That seems reasonable. You can still make significant shifts with that, but can't jam five guys around short when there's a runner on third, for that batter that only pulls his ground balls.

Exactly. Costco gross profit margin is 13% compared to Walmart (not Sam’s Club) is around 24%.

By charging a membership fee you recoup some of that lost margin and encourage repeat business as customers look to recoup their membership fees through membership rewards.

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Yeah, and when you factor in that people can pool their money as well, that's even better.

They don't.

You pay the money, you get the membership. They don't restrict it to certain people.

I mean, I guess you could say that people who can and will pay $60 a year for a membership are a "certain kind" but that's only $5 a month so it's not exactly exclusive.

One reason for memberships is that if they catch you shoplifting or abusing the return system, they can revoke your membership. This helps keep costs lower.

They don't restrict anybody. BUT, you do need to sign up for a membership, which costs a little money. In reality most people make that back in gas savings , $1.50 hot dogs and $5 rotisserie chickens.

Aside from the benefits people have already mentioned, in the current climate, having people not able to anonymously come into your store and steal things is a great benefit for them. I would imagine their theft rate is at least an order of magnitude below other big box stores. They treat their employees and customers well, and because of that the customers and employees treat them well in return.

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Planet fitness model before planet fitness did it. Many people will pay the membership and only shop there a handful of times throughout the year. They are able to offset prices and costs further because of this.

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Well their method is gaining money from the memberships as a way to lower the prices of the goods for sale slightly. They definitely want more customers but they want them to be able to pay for the membership. It also gives them an “exclusive” feeling which can help to boost sales.

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> And still today there are places where a rowing boat is just as versatile as a car and therefore just as common.

I’m kinda skeptical of that and would be interested to know where this is, however assuming this is true… this places highly restrictive geographic requirements as a barrier to entry and you still need a boat, oars, and a way to either transport it to/from the water or store it nearby. Not exactly something kids can do in any playground on earth.

The kinds of customers who would shop at warehouse clubs generally would have no issues spending about $60/year on a membership, and these warehouse club chains generally choose locations where there is no shortage of customers

If they didn't charge for memberships, prices would have to be adjusted elsewhere to make profit for the company.

There is Rugby football, Gaelic football, Australian football, Gridiron football, etc.

He’s an example I remember from my textbook. Let’s say you are really passionate about protecting the environment. But after a picnic outdoors you don’t take your trash to the garbage can, you just threw it on the ground. You feel guilty for doing that. The guilt you feel from discrepancy between your values (environmental protection) and your actions (littering) is cognitive dissonance.

The question is, how does this dissonance motivate you to alleviate that guilt? Do you change your behavior, for example, by going back and picking up after your trash properly? Or does it make you change your underlying belief system (“maybe protecting the environment wasn’t so important to me after all”).

I definitely can say that you helpful people here helped me understand my misunderstanding on what was part of the metric system. I can't believe I thought SI was just to do with "prefixes" and "being divisible by 10s".

I am probably the definition of "lay person" when it comes to mathematics. It doesn't help that high school was many years ago lol.

There are other football codes - Australian rules is hugely popular ( and worth watching), American, rugby union and rugby league.

Using the proper name avoids ambiguity and in this context is helpful.

Derived units still count as SI assuming they are coherent, coherence is the important thing here.

To be more specific, the Liter is simply a special name for the cubic decimeter (1 tenth of a meter, cubed)

The Liter is defined by its relation to the Cubic Centimeter, which is equal to the milliliter.

I'm learning a lot from this thread. I thought hectare was an SI unit lol.

In short, you can't take just base units and multiple them together to get a Litre.

What I mean by that is that in order for a unit of volume to be coherent with SI units it would have to be ONE meter times ONE meter times ONE meter. Not 1.5 meters, not 0.1234232 meters. Not any other amount of meters besides 1. And the same would go for any of the base units (second, kilogram, amp, kelvin, mole, and candela) and deriving a unit from them.

With a liter you going 0.1 meters times 0.1 meters times 0.1 meters.

This means that the "coherent" unit for volume would be a cubic meters. The thing is that's... a really big volume so we just don't use that day-to-day.

There are of course plenty of other derived units that are coherent. Like newtons, hertz, etc.

A goal of the SI is to limit the number of base units to the minimum number possible. There is no SI base unit of volume because you can just use cubic meters. Similarly, there is no SI base unit for surface area because square meters already fulfil that need, even though hectares exist as a non-SI but SI-compatible unit.

Liters are a metric unit (it's based on the meter and powers of ten) but it is not an official SI unit because it is redundant.

Instability in weather patterns and more extreme weather events are one of the consequences of global warming, often refered to as global weirding.