But to make sense of the patterns of PPP GDP (as the example @pkrugman.bsky.social also shows) you need to think about open many-good economies: the domain of international trade, often an optional course taught in isolation from macro.
Canβt help but feel that this is because const. price GDP is central to macro - a compulsory econ course, and one that generally taught using the abstraction of a closed one-good economy.
In my experience, people are generally comfortable with the concept of real (const. price) GDP controlling for price differences across time. But even many with econ training are confounded by real (PPP) GDP controlling for price differences across space.
The global economy continues to show resilience in the face of the tariff shock - but risks are rising. Summary of todayβs IMF World Economic Outlook update: www.imf.org/en/blogs/art...
Heβs fed, Jim!
Trade JMCs: Each year, I compile a list of international-trade job-market papers. To make sure you're on my list (& save me some work), please reply with your info in the following format:
Firstname Surname (School) - JMP title - homepageURL
[Spatial JMCs: reply to other post]
Graph of the Bilateral Trade in Services (BiTS) database coverage. While trade debates focus on tariffs and goods, services have quietly defied deglobalisation and become an increasingly important driver of growth. Services trade not only generates productivity spillovers and labour-market gains, but it is also where future policy tensions could emerge. Yet services trade remains under-measured and under-studied. This column introduces the new Bilateral Trade in Services (BiTS) database, which tracks services flows between countries over time and at the detailed sector level. It documents a declining distance elasticity for services trade in recent years, which is driven by the growing importance of less distance-sensitive service categories.
Nan Li, Sergii Meleshchuk, & @zymek.bsky.social introduce the new Bilateral Trade in Services (BiTS) database, which tracks services flows between countries over time and at the detailed sector level. They document a declining distance elasticity for services trade.
cepr.org/voxeu/column...
#EconSky
The analysis in our chapter is based on a new database on bilateral services trade which we have been compiling for the past year. We expect to publish it for others to use later this summer.
However, it appears that trade in modern services (the fastest-growing portion of international services trade) is most vulnerable to geoeconomic fragmentation. This could emerge as a headwind for services globalisation going forward.
We find that - in contrast with goods trade - the answer is: no (so far!).
My colleague Nan Li and I contributed a chapter on services trade. We ask: is there evidence that geopolitical alignments are reshaping bilateral trade in services? (In IMF parlance: is there βgeoeconomic fragmentationβ in services?)
CEPR today released a new eBook on βThe State of Globalisationβ (edited by @baldwinre.bsky.social and Michele Ruta). It explores how technology, policy and geopolitics are transforming globalisation: cepr.org/voxeu/column...
πIMF April WEOπ:
2025 global growth forecast would have been 3.2% pre-April 2 (down just 0.1 from January). It is 2.8% given the post-April 2 trade policy announcements. Even if all βtariff pausesβ become permanent, global growth remains at 2.8% (but differently distributed across countries).
I stand corrected. The formula is not deficit/imports. The formula is surplus/(imports * Ξ΅ * Ο), where Ξ΅ = -4 and Ο = 0.25. That happens to equal deficits/imports.
ustr.gov/issue-areas/...
via @ericadyork.bsky.social
π¨New data alert!
A beta version of the Global Tariff Database is now available! πhttps://feodorateti.github.io
πIf you're looking for cross-country data on bilateral tariffs, this might help you.
1/ π’ New paper alert! π Together with Vitalii Tubdenov, we propose a measure of the "Average Period of Production" (APP) to capture the temporal dimension of production processes. It is inspired by BΓΆhm-Bawerkβs capital theory.
Today marks the 180th anniversary of the birth of great Irish/Oxford economist Francis Ysidro Edgeworth.
Most remembered now by students for the Edgeworth Box, he was the founding editor of the Economic Journal and is buried less than 400 feet from the Economics Dept with a beautiful Celtic cross.
Trade talks is back! Scientific insights on trade: tradetalkspodcast.com
Nice chart by @chrisgiles.ft.com putting the scale of President Trumpβs tariff announcements in historical context. www.ft.com/content/c2e4...
The adverse effects of trade and globalization have become politically salient in a way that many of the other determinants of inequality have not. | Trade and Inequality | The IFS-Deaton Review | all open access | academic.oup.com/ooec/article...
Modern supply chains don't look like trade theory 101!
They involve constant border crossings, each now hit by tariffs.
Tariffs raise prices, but the more important thing they do is disrupt supply relationships.
1/
New at JIE: "Changing global linkages: A new Cold War?" by Gita Gopinath, Pierre-Olivier Gourinchas (@pgourinchas.bsky.social), Andrea F. Presbitero, Petia Topalova
https://doi.org/10.1016/j.jinteco.2024.104042
CALL FOR PAPERS!
What: Workshop on Growth, Trade and Geography
Where: BSE Summer Forum, Barcelona
When: June 10-11, 2025
Submission Deadline: February 28, 2025
events.bse.eu/live/files/5...
I hope to see many of you there!!! Please circulate!
Conventional wisdom seems to be that for many important services (think tourism!) the exporter has much better information about the extent/value than the importer.
Unlike with goods, there is no customs data on which to base services trade statistics - just firm surveys, the methodology of which may not be consistent across countries. And the extent to which they capture the βtruthβ may not be symmetric between the importer and exporter.
βThat will require transformational reforms to lift productivity. In many countries, resourcesβincluding workers and capitalβsimply aren't flowing to the most dynamic firms, dragging average global productivity growth down by 0.6 percentage points annually.β www.washingtonpost.com/opinions/202...
I used to teach the history of the gravity equation in trade - but was oblivious to the long history of gravity in urban/spatial economics (until I worked on gravity and the spread of Covid-19 with Ale CuΓ±at: www.sciencedirect.com/science/arti...)
Image of the Moon, on a background of the blackness of space, and foreground at right of Earth's atmosphere in shades of blue, taken by ESA astronaut AndrΓ© Kuipers from the ISS in 2012.
Hello @bsky.app, here's to looking into more #bluesky and beyond... π
