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Macroeconomics
Course: Macroeconomics > Unit 2
Lesson 4: Inflation- Introduction to inflation
- Actual CPI-U basket of goods
- Inflation data
- Deflation
- Example question calculating CPI and inflation
- Stagflation
- Deflationary spiral
- Tracking inflation
- How changes in the cost of living are measured
- How the United States and other countries experience inflation
- The confusion over inflation
- Lesson summary: Price indices and inflation
- The Consumer Price Index (CPI)
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Inflation data
Looking at actual sequential and year-over-year inflation data. Created by Sal Khan.
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- What is the difference between the Consumer Price Index and the Retail Price Index?(19 votes)
- Why is it labeled "UN-adjusted", how would an "adjusted" calculation be made?(9 votes)
- Things are seasonally adjusted in order to remove any kind of seasonal component in the data.
Think about how people consume more before Christmas. Employment also increases before Christmas because a lot of temporary retail workers are hired. Also, many food and agricultural items have seasonal tendencies in their pricing because when they are out of season they are scarcer and more pricey.
If you are studying any of those above items, you need to adjust for these tendencies. Unfortunately I can't give you a general method of doing that because each type of item will have a different statistical model.(20 votes)
- Where can I find critiques of the pros and cons of the CPI as a measure of real inflation?(10 votes)
- So many limitations of the measurement of inflation exist, is it possible that they don't reflect the actual situation of the economy at all?(7 votes)
- There are plenty of issues with the way inflation is measured but as long as you stick to the same formula you will get relevant results. However, in the long run sticking to the same formula will end up making the results irrelevant thanks to changes in how the economy works is in the real world so you always have to re-visit the models and update them. So to answer your question; They do reflect the real economy and has proven to do so well. However, they need to be revised now and again to remain relevant.(7 votes)
- So if I won't eat no food and use no energy I'm good?;)
Seriously though, why do we factor out food and energy? I mean, if they go up - it still means we have to pay more each year for the same products.(3 votes)- This is a source of contention for a lot of people. Keep in mind food and energy prices are only kept out of core inflation data. There are plenty of other calculations of inflation that take food and energy into consideration. The reason they are kept out of core inflation is to eliminate volatile seasonal factors. If a drought causes food prices to temporarily spike, or a hurricane causes fuel prices to spike, these events aren't seen as inflation. They are seen as temporary seasonal factors that will correct themselves after the event is over.(11 votes)
- consumer basket of poor, middle class and rich class person differ a lot so, how can we calculate the consumption basket of average earning person(5 votes)
- The market basket only takes into account the prices of certain goods. For example, say the government uses a Pickup Truck in the market basket. It doesn't matter if you are rich or poor, you will still pay about the same price nationwide for that same truck, if you are buying it brand new from the dealerships. If you are saying that poor people don't buy new trucks, then you're right. However, market baskets are not meant to measure costs of living. Just inflation.(4 votes)
- how can we control inflation ?(3 votes)
- Stop increasing the money supply. Allow true, free market forces to determine interest rates rather than being set arbitrarily by an "omniscient" Fed.(3 votes)
- how do you calculate inflation rate as measured by the consumer price index(3 votes)
- The CPI has a base in which it is 100. To find the inflation rate for any year, you simply divide the CPI from the end of the year by the CPI at the end of the previous year, and subtract 1 to get the percentage rate. So if the CPI for some year is 131, and the next year it is 135, then the inflation rate was 135/131-1.
If you want to do it over multiple years, then you need to recognize that inflation compounds. So if you want to find annualized inflation over a 5 yr period, then you would take CPI in year 5 divided by CPI in year 0, and then take the 5th root of that to get the annualized rate.(2 votes)
- Does the strength of the dollar in foreign money markets affect the inflation rate?(2 votes)
- I think the reverse is more accurate: inflation affects the strength of the dollar. There are many feedback loops, though, so it is possible that we can "export inflation" via exchange rates -- basically, pass the cost on to others.(1 vote)
- what is the ideal rate of inflation for economy like india G.R 7%,AND WHY(1 vote)
- There is no ideal rate of inflation. Inflation can be anything as long as it is stable and predictable.(2 votes)
Video transcript
In the last video, we talked a
little bit about what inflation is, and the Consumer
Price Index. And so I thought I would
actually show you data and maybe point out a
few interesting things right over here. So this right over here is
the monthly press release, or it's the table from the
monthly press release, issued by the Bureau of
Labor Statistics. And this is Table
A, which is really a summary of all the
important things. It's the percent changes in
CPI for all urban consumers, the CPI-U. And they do it for
non or urban consumers and all the rest. But the CPI that is
quoted is the one for urban consumers,
the US City Average. And what I always find is
that the details are much more interesting than what
you hear just on the news when people say, oh,
the CPI changed by 0.5%. And one thing I
do want to point-- and this is true of the CPI,
this is true of all government statistics; in fact, this
is true of any report that any company
gives you-- it's very important to keep
in mind whether they're giving a sequential
change or whether they're giving a year-over-year change. So for example, there might be
a press release like this one, and the text of it, or
maybe the headline number when you look at your local
newspaper or your news report, will say, look in June 2011
inflation on all items, on the entire basket of
goods, went down by 0.2%. And you might say, oh wow,
look, there's no inflation. In fact, prices are going down. This would be minor deflation. But it's important to
realize that this is only the seasonally adjusted
prices from May to June. Now, when I talk about
seasonally adjusted-- and traditionally, maybe
people use a different amount of energy, a different amount
of gasoline from May to June. And they try to factor
that in when they compare the basket of good, the
price of the basket of good, from May to June. So that's what they talk
about seasonally adjusting. But if you look over
here, the prices went down for May
to June according to adjusting it for the season. But they year-over-year
changes are still up. If you compare June 2011 to June
2010, it is still up by 3.6%. And in general,
the monthly things are going to be a little
bit more volatile. Obviously, you have the
seasonal adjustments. You have other short-term
factors that might change it. But the year-over-year
one is a stronger signal for what is actually
happening for inflation. Although someone might
want to pay attention to the monthly one, because
that's obviously giving you the most up to date of
what's happening now. And what you'll
often see is, they'll give an inflation
number for everything, and then they'll subtract
out food and energy. So this is all items
less food and energy. And that's because
food and energy, they represent a good
bit of the basket, but they're very, very volatile. You can see it right
here in this report, year-over-year energy has
gone up double digits, 20% for energy generally. If you look at fuel oil,
35.6%, at least on this report. It's been coming
down more recently. But year-over-year it's
been up a huge amount. And so that's actually the main
driving factor for this 3.6%. If you take food and
energy out of the equation, if you compare the basket
of goods minus that, inflation was only up 1.6%. It's interesting. Even within that, you can look
at which parts of the economy, or which products and
services, are getting a lot more expensive and which
ones are getting cheaper. It's actually interesting
that used cars and trucks are up 5.1%. That seems like a pretty strong
price increase for used things.