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Scott Irwin Profile picture
@ScottIrwinUI
May 27, 2020 • 8 tweets • 3 min read • Read on X
1. Good message here about early crop condition ratings. Just don't contain much information. This gives me the chance to review some previous #fdd articles on condition ratings.
2. First up is a pair of #fdd articles on high early season corn and soybean ratings from 2018. Corn farmdocdaily.illinois.edu/2018/06/what-t… and soybeans farmdocdaily.illinois.edu/2018/06/high-e…
3. These articles cover: i) degree of bias in early season corn and soybean condition ratings, and ii) degree of predictability in early season corn and soybean condition ratings.
4. Here is the average change from first to last ratings for corn. Note larger bias after 1998. Ratings hardly ever go up much from first to last. Hard to figure out why. Image
5. Similar story for soybeans. Why the bigger bias the last 20 years? Image
6. This chart shows correlation of condition ratings with final US average corn yield. Correlation of first rating is low, 0.20, but not zero. Based on first rating of 70 could lean slightly above trend for 2020. Image
7. Pattern of correlation of condition ratings and US average soybean yield by week different than corn. Starts higher but increases more slowly. Image
8. I always thought there was a lotta insight about corn and soybean yields in previous 2 charts. Late June-July weather critical for corn and correlations reflect that. Soybean critical growing period stretches well into August and correlations reflect that.

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More from @ScottIrwinUI

Scott Irwin Profile picture
Mar 20
1. I guess today is the day to talk about corn yields. Just received an email from @aaea announcing a new Choices article "A Slowdown in US Crop Yield Growth" by David Boussios. Here is the link: choicesmagazine.org/choices-magazi…
2. The author of the Choices article argues: "The statistical evidence of a productivity slowdown in crop yield growth builds each year. The linear yield growth trends since 2013 for corn, soybeans, and wheat are all statistically lower than one starting in 1988. Models, forecasts, market participants, and policy makers should consider that yields in the future will probably be lower than forecasted by the USDA and that extrapolating trends into the future without revision is problematic."
3. This argument is especially interesting because I have seen similar arguments in the grain trade in the last few years. We can all agree that the US average corn yield has been relatively flat since around 2013. That is obvious looking at a chart of corn yields. But one has to be extremely careful in then leaping to the conclusion that productivity growth in corn yields has also slowed. The reason is that runs of poor or good weather can mask the true underlying trend in small samples of years.
Read 7 tweets
Scott Irwin Profile picture
Nov 1, 2023
1. Recommended Reading for the Day: Fascinating new FDD from my colleagues on the farmdoc team, led by Carl Zulauf. Long-term look at real crop prices. farmdocdaily.illinois.edu/2023/10/the-po…
2. It has long been a staple of economic thinking that real (inflation adjusted) commodity prices have a strong tendency to decline over time. Probably the most famous example of in this regard is the bet about real commodity prices between Julian Simon and Paul Ehrlich in 1980. See the details here:
3. Carl and team put together the data for a USDA index of real crop prices going back to 1912. This is the chart shown below. Lots of interesting history here, but the 30 year period of stable real crop prices that began around 1990 is unmistakable. The question is whether this is a pause in a very long run downward trend or something new.
Image
Read 8 tweets
Scott Irwin Profile picture
Sep 28, 2023
1. Excited to announce that the band is back together! Actually, talked Darrel Good into coming out of retirement to work on this FDD: "The New Era of Crop Prices: A 15-Year Review." farmdocdaily.illinois.edu/2023/09/the-ne…
2. When crop prices started to take off in 2006-07, a huge question was whether this was just another spike like we had seen so many other times, or was this the beginning of a permanent jump in the level of average prices, like in 1973. Image
3. For some reason (temporary insanity?), Darrel and I decided to stick our necks out and predict that a new era in crop prices was afoot AND make specific predictions for the average price and trading range in the new era. As this chart shows, we did not have much data to go on.
Image
Read 8 tweets
Scott Irwin Profile picture
Jun 1, 2023
1. Ok, I have hopefully convinced you that the RIN cliff scenario is a logical possibility. Now what are the chances of it actually happening? The first step is to estimate QM in the graph below. Turns out the proposed RVOs released by EPA last December are the place to start. Image
2. We can use the proposed RVOs to come up with a defensible estimate of the maximum demand for biomass-based diesel (BBD) for 2023, 2024, and 2025. We can do this because we know mandates are and will be binding. Image
3. I will leave the details of the computations to the article. Suffice it to say that under the EPA's preliminary rulemaking, the max amount of BBD needed is about 4BG each year. That is national demand for sum of RD and BD. Image
Read 11 tweets
Scott Irwin Profile picture
Jun 1, 2023
1. Ok, had to take a brief pause for the cause (a meeting). Anyway, diving into the heart of the RIN cliff idea in this thread based on our latest FDD. farmdocdaily.illinois.edu/2023/05/is-the…
2. Here is how RIN pricing works when BBD production is equal to the mandated quantity. In this case, looking at an example of D4 biodiesel RIN pricing on May 4, 2023. Predicted D4 RIN price is $1.61 and actual on this date is $1.58. Pretty close. Everything A OK. Image
3. But what if for some exogenous reason, biomass-based diesel (BBD) production is pushed past the RFS mandate? This is the RIN cliff scenario. New market equilibrium is given by intersection of demand w/tax credit and fixed QRC supply of BDD. Red line becomes supply curve. Image
Read 8 tweets
Scott Irwin Profile picture
Jun 1, 2023
1. Our latest FDD on the renewable diesel boom is titled "Is the U.S. Renewable Fuel Standard in Danger of Going Over a RIN Cliff?" That should get your attention this morning. It is going to take me several twitter threads to go through the highlights.

farmdocdaily.illinois.edu/2023/05/is-the…
2. In this thread, I am going to go through the first part of our analysis. Start with the very basics of binding and non-binding RFS mandates. In a standard supply/demand framework, here is a binding mandate. Image
3. A binding mandate "binds" in economic terms because the mandate volume exceeds the competitive market equilibrium quanitity. To get the higher than equilibrium Q produced, producers have to be offered a higher price and consumers a lower price. Image
Read 9 tweets

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