🧠 Feedback also explains a sizable share of manager quality, measured by value-added to worker productivity.
💡New insight for management: feedback is more than information transfer. The tone and information shape worker productivity and retention.

🛠️ Constructive feedback doesn’t affect future code quantity and lowers quality, as developers revisions to reviewed code crowd out careful new code development.

❌ Toxic feedback reduces future code quantity , quality, and retention
⚪ Non-toxic criticism has no such detrimental effect.
✅ Positive feedback increases productivity, retention, and even spillovers to coworkers.

Using LLMs, she classifies 200M+ feedback messages by tone (🤬toxic/nontoxic, 👍positive/negative) and content (🛠️constructive/non-constructive), leveraging random reviewer assignment to identify causal effects on developer productivity and retention.

A counterfactual 10% tariff on imported inputs would offset most of these gains and compress the firm size distribution.
The analysis links technological changes in input market efficiency to policy instruments like tariffs that affect firms in similar ways.

In general equilibrium, a 40% reduction in supplier search costs raises:
📈 Real GDP ~13%
🏢 The share of output produced by the largest firms ~12.7%
Aggregate activity shifts toward the most productive firms, while non-importing firms lose market share through general equilibrium effects.

These patterns motivate a quantitative general equilibrium model of supplier search and bargaining.
When supplier search costs fall, productive importers form broader supplier networks and expand production.

Using detailed firm-level import data from SWE he documents 4 key patterns:
1️⃣ Growing dispersion in imported input varieties
2️⃣ Rising inequality in importer sales
3️⃣ Larger firms pay lower input prices
4️⃣ Firms in areas with better digital infrastructure import more varieties, especially large firms

His findings show how personal experiences shape healthcare demand and how severe adverse events can erode trust in vaccines, informing future vaccination campaigns.

These effects persist even among those with high health literacy but weaken for people with frequent healthcare contact. Learning is narrow: adverse events from non-vaccine drugs barely affect later vaccination behavior.

A striking case: the 2009–2010 swine flu vaccine, linked to narcolepsy—a chronic neurological disease. Those exposed had much lower COVID-19 vaccination rates over a decade later, with spillovers to family members—showing how experiences shape perceptions of vaccine risk.

Vaccination is both a private and public good. Using Swedish data linking vaccination records, adverse reactions, and healthcare use, he studies how personal healthcare experiences shape vaccination choices.

🎁 Bonus insight: economies with a larger services sector are less exposed to supply shocks.
It is a sharp, well-quantified paper showing how long-run structural change reshapes short-run macro dynamics.

🔍 Tiago shows this both empirically and theoretically, in a quantitative two-sector heterogeneous-agent model with non-homothetic preferences and sector-specific price rigidities.
In his JMP, he also finds that structural transformation widens the uneven effects of monetary contractions.

🏷️ Why? Service prices adjust much more slowly than goods prices: only 11% change monthly, versus 35% for goods.
More services ➡️ higher aggregate price rigidity.
That means the Phillips curve flattens, and the short-run effects of monetary policy become stronger.

📈 Over the past 50 years, U.S. consumption has shifted from goods to services — services now account for almost 70% of spending.
Tiago shows that this structural transformation made monetary policy 21% more powerful between 1970 and 2019.