Vedo che su FaceBook va molto di moda condividere frasi e fotografie raccattate durante le peregrinazioni nel web.
Cose per tirarsi e tirare su di morale o aumentare l'autostima del
tipo: "Io sono il comandante della mia nave e non mi chiamo Schettino"
oppure "Nessun pranzo é gratis e anche la fila alla mensa dei poveri è
molto lunga" o anche " Sono figo e chi mi dice che sono figo è figo
anche lui: metti un mi piace che ti metto un mi piace così ci
piacciamo", cose così.
Non considero tutto il filone delle
condivisioni appartenenti alla categoria "è sempre colpa di
qualcun'altro" perchè sono tristi di loro e non mi sento d'intristirle
ulteriormente. D'altronde basta fare un giro al mercato e questo tipo di
condivisioni circolano da sempre, da ben prima di Fb, internet o
addirittura dei transistor.
Voglio, questa sera prima di andare
a letto, condividere qualcosa anch'io per non sembrare troppo
antiquato, riservato e demodé.
Per la serie "Siamo tutti
economisti", categoria tra le più condivise, scopiazzo e incollazzo da
wikipedia (pagina in italiano inesistente su wiki):
http://en.wikipedia.org/wiki/The_Theory_of_Interstellar_Trade
The Theory of Interstellar Trade
From Wikipedia, the free encyclopedia
Jump to: navigation, search
The Theory of Interstellar Trade[1] is a paper written in 1978 by
economist Paul Krugman. The paper was first published in March 2010 in
the journal Economic Inquiry.[2] He described the paper as something he
wrote to cheer himself up when he was an "oppressed assistant
professor," caught up in the academic rat race. [3]
Krugman analyzed the question of
how should interest rates on goods in transit be computed when the
goods travel at close to the speed of light? This is a problem because
the time taken in transit will appear less to an observer traveling with
the goods than to a stationary observer.
Krugman emphasized
that in spite of its farcical subject matter, the economic analysis in
the paper is correctly done. In his own words,
while the
subject of this paper is silly, the analysis actually does make sense.
This paper, then, is a serious analysis of a ridiculous subject, which
is of course the opposite of what is usual in economics.
Commentary
Responding to the paper, economist Tyler Cowen speculated on how time travel affects time preference discounting.[4]
My own puzzling focuses on the determinants of real interest rates,
given how time dilation changes the meaning of time preference. As you
approach the speed of light you move into the future relative to more
stationary observers. So can you not leave a penny in a savings account,
take a very rapid spaceflight, and come back to earth "many years
later" as a billionaire? Hardly any time has passed for you. In essence
we are abolishing time preference, or at least allowing people to lower
their time preference by spending money on fuel. I believe that in such
worlds the real interest rate cannot exceed the costs at which more fuel
can "propel you into the future through time dilation."
Assume
you have a spaceship that can approach lightspeed and thus you can
make, say 1000 years, seem like 10 years. If you can gain the time value
of money 100x faster, that effectively makes the interest rate 100x
higher for you. Thus time preference is meaningless. This is a problem
for economic theory. Krugman's solution is to force the interest rate to
correspond to the cost of making the trip.
Here is the standard compound interest formula:
FV = PV(1+i)n
Fuel costs for the above trip are $X. Let's say you have $1000 to
invest and wonder whether it's worth taking a near-lightspeed voyage to
increase your return 10 subjective years from now.
Stay on earth:
A = $1000(1 + i)10
Take trip:
B = ($1000(1 + i)1000) – $X
Krugman says that its necessarily true that A=B, for time preference
theory to stay consistent; thus it will be driven by X. In the future,
given a free market, spaceship fuel costs will be the primary
determinant of interest rates. The less the fuel cost, the less the
interest rate, and vice versa.
Related theories and publications
In 2004, Espen Gaarder Haug published a theory he titled
"SpaceTime-Finance" in Wilmott Magazine to show how a series of finance
calculations had to be adjusted to avoid arbitrage when hypothetical
traveling at very high velocities relative to other observers (traders).
He illustrated how such necessary adjustments already could be
measurable at the speed of the space shuttle, but also that such
calculations and adjustments was of little or no practical relevance
today since we all are moving at the nearly same speed relative to the
enormous speed of light.
In 2008, John Hickman at Berry
College, Georgia USA published in the Journal of Astro Politics an
article related to the political and cultural obstacles that could be
related to hypothetical interstellar trade.
Cose per tirarsi e tirare su di morale o aumentare l'autostima del tipo: "Io sono il comandante della mia nave e non mi chiamo Schettino" oppure "Nessun pranzo é gratis e anche la fila alla mensa dei poveri è molto lunga" o anche " Sono figo e chi mi dice che sono figo è figo anche lui: metti un mi piace che ti metto un mi piace così ci piacciamo", cose così.
Non considero tutto il filone delle condivisioni appartenenti alla categoria "è sempre colpa di qualcun'altro" perchè sono tristi di loro e non mi sento d'intristirle ulteriormente. D'altronde basta fare un giro al mercato e questo tipo di condivisioni circolano da sempre, da ben prima di Fb, internet o addirittura dei transistor.
Voglio, questa sera prima di andare a letto, condividere qualcosa anch'io per non sembrare troppo antiquato, riservato e demodé.
Per la serie "Siamo tutti economisti", categoria tra le più condivise, scopiazzo e incollazzo da wikipedia (pagina in italiano inesistente su wiki):
http://en.wikipedia.org/wiki/The_Theory_of_Interstellar_Trade
The Theory of Interstellar Trade
From Wikipedia, the free encyclopedia
Jump to: navigation, search
The Theory of Interstellar Trade[1] is a paper written in 1978 by economist Paul Krugman. The paper was first published in March 2010 in the journal Economic Inquiry.[2] He described the paper as something he wrote to cheer himself up when he was an "oppressed assistant professor," caught up in the academic rat race. [3]
Krugman analyzed the question of
how should interest rates on goods in transit be computed when the goods travel at close to the speed of light? This is a problem because the time taken in transit will appear less to an observer traveling with the goods than to a stationary observer.
Krugman emphasized that in spite of its farcical subject matter, the economic analysis in the paper is correctly done. In his own words,
while the subject of this paper is silly, the analysis actually does make sense. This paper, then, is a serious analysis of a ridiculous subject, which is of course the opposite of what is usual in economics.
Commentary
Responding to the paper, economist Tyler Cowen speculated on how time travel affects time preference discounting.[4]
My own puzzling focuses on the determinants of real interest rates, given how time dilation changes the meaning of time preference. As you approach the speed of light you move into the future relative to more stationary observers. So can you not leave a penny in a savings account, take a very rapid spaceflight, and come back to earth "many years later" as a billionaire? Hardly any time has passed for you. In essence we are abolishing time preference, or at least allowing people to lower their time preference by spending money on fuel. I believe that in such worlds the real interest rate cannot exceed the costs at which more fuel can "propel you into the future through time dilation."
Assume you have a spaceship that can approach lightspeed and thus you can make, say 1000 years, seem like 10 years. If you can gain the time value of money 100x faster, that effectively makes the interest rate 100x higher for you. Thus time preference is meaningless. This is a problem for economic theory. Krugman's solution is to force the interest rate to correspond to the cost of making the trip.
Here is the standard compound interest formula:
FV = PV(1+i)n
Fuel costs for the above trip are $X. Let's say you have $1000 to invest and wonder whether it's worth taking a near-lightspeed voyage to increase your return 10 subjective years from now.
Stay on earth:
A = $1000(1 + i)10
Take trip:
B = ($1000(1 + i)1000) – $X
Krugman says that its necessarily true that A=B, for time preference theory to stay consistent; thus it will be driven by X. In the future, given a free market, spaceship fuel costs will be the primary determinant of interest rates. The less the fuel cost, the less the interest rate, and vice versa.
Related theories and publications
In 2004, Espen Gaarder Haug published a theory he titled "SpaceTime-Finance" in Wilmott Magazine to show how a series of finance calculations had to be adjusted to avoid arbitrage when hypothetical traveling at very high velocities relative to other observers (traders). He illustrated how such necessary adjustments already could be measurable at the speed of the space shuttle, but also that such calculations and adjustments was of little or no practical relevance today since we all are moving at the nearly same speed relative to the enormous speed of light.
In 2008, John Hickman at Berry College, Georgia USA published in the Journal of Astro Politics an article related to the political and cultural obstacles that could be related to hypothetical interstellar trade.
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