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I have a different take on the transaction. If by "yield" you mean "interest rate" then you have that part correct. As to your claim about currency fluctuation, you say if yen weakens the trade is less lucrative. You may be correct, so help correct my faulty thinking.
I borrow 100 yen and buy with it $1 USD to invest. During the course of the loan the yen weakens and it only takes 80 cents to pay off that 100 yen loan. I don't claim any level of financial sophistication, but it would seem to me this is a profitable situation, one that became more lucrative over the course of the loan.
Conversely, I borrow 100 yen and buy with it $1 USD to invest. During the course of the loan the dollar strengthens such that it only takes 80 cents to pay off that 100 yean loan. Again, simple man that I am, it would seem this transaction has also became more lucrative.
There's no doubt that tech stocks hurt markets on Monday but it was Japan that dropped so precipitously that triggered the global worries. Probably just a coincidence that the big unwind of yen carry trades happened too?
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yes , yield = interest rate . let's chop this up a bit more . i'll try my best to stick with your example :
you borrow 100 yen @1% for a year. you take your loan and use it to buy $1usd which you then lend at 5% . at the end of the year you take your $1.05 and repay the yen . you started with nothing except to qualify for the loan and ended up with 4 yen , and it actually doesn't matter what the comparative yields are on the back end b/c this is all by contract .
in this scheme , the wider the spread that you can contract the juicier the deal ; plug in .5% and 8% you end up with 7.5 yen . conversely if the spread is narrower the juice gets thinner . that the strong yen is a cornerstone of the scheme is probably why it's referred to as yen carry trade .
anyways that dynamic has changed , which is why Japan is seemingly on sale lately ( why do I have the impression that you vacayed in Japan recently ? I know you do love a bargain ) , my read is that this is due to the same post-pandemic rephasing that every economy has had to absorb , but the past two years in Japan have been characterized by rising inflation and which is why BOJ is hiking interest rates rn . meanwhile the dollar is strengthening .
my biggest question in terms of your op ( is yen carry trade responsible for Monday ? ) is why or how would currency contracts implicate the price of assets ? even if there is an iceberg of yen carry contracts I find the idea dubious . from what i've read this week I believe the nikkei is following investor pessimism around a US recession .