{ "149332-21906243": { "datetime_modified":"20261012T104103", "datetime_start":"20261102T160000", "datetime_end":"20261102T172000", "has_end_time":1, "date_start":"2026-11-02", "date_end":"2026-11-02", "time_start":"16:00:00", "time_end":"17:20:00", "time_zone":"America\/Detroit", "event_title":"Easy to Collect, Costly to Bear: Mobile Money Taxation and Network Spillovers in Tanzania", "occurrence_title":"", "combined_title":"Easy to Collect, Costly to Bear: Mobile Money Taxation and Network Spillovers in Tanzania: Youssef Benzarti, University of California, Santa Barbara", "event_subtitle":"Youssef Benzarti, University of California, Santa Barbara", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"This paper provides evidence that a tax on mobile money transactions shrinks its base by an order of magnitude more than taxes on income or turnover do, that the base responds to whether it is taxed rather than to how much, and that the damage spreads through the payment network to users and payments the law never taxed. First, using the complete transaction records of Tanzania\u2019s three largest providers around the introduction of a notched levy on person-to-person transfers and cash withdrawals in July 2021, we show that the levy reduces the volume of taxed transactions by 23 percent and their average value by 13 percent relative to untaxed transactions on the same platform, an elasticity with respect to the net-of-tax price of about 10. Second, we show that a cut of about 30 percent seven weeks later brings none of it back, nor do two further cuts, while the removal of the levy on transfers in 2023 does, slowly. Third, we document that relationships between senders and receivers survive at two-thirds the normal rate, that new ones form at less than half the pre-levy pace, and that senders stop rerouting activity around recipients who go quiet; none of these margins recovers when the tax rate falls. Fourth, we find that the levy reaches activity it does not tax, as wages paid into wallets fall by a fifth, and that senders of every size cut back by a similar share, whether or not they have a bank account. Fifth, we estimate that the levy destroys 47 cents of surplus for every shilling it raises, several times the cost of a value-added tax in comparable settings.", "occurrence_notes":"For those not familiar with the academic and residential towers of North Quad, please refer to this link for wayfindng guidance: https:\/\/lsa.umich.edu\/content\/dam\/econ-assets\/Econdocs\/NQ%20Econ%20Department%20Directions.pdf", "guid":"149332-21906243@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149332", "building_id":"1005177", "building_name":"North Quad", "campus_maps_id":"553", "room":"4325", "location_name":"North Quad", "has_livestream":0, "cost":"", "tags":["Public Finance","seminar","Economics"], "website":"http:\/\/www.lsa.umich.edu\/econ", "sponsors":[ { "group_name":"Department of Economics", "group_id":"3302", "website":"http:\/\/www.lsa.umich.edu\/econ" }, { "group_name":"Public Finance", "group_id":"3553", "website":"" }, { "group_name":"Department of Economics 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"event_type":"Conference \/ Symposium", "event_type_id":"5", "description":"", "occurrence_notes":null, "guid":"150389-21915523@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/150389", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":"Florent Gillet Lobby", "has_livestream":0, "cost":"", "tags":["Sessions"], "website":"https:\/\/sessions.studentlife.umich.edu\/p\/track\/17096", "sponsors":[ { "group_name":"Sessions @ Michigan", "group_id":"4791", "website":"https:\/\/sessions.studentlife.umich.edu\/" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":4, "first_occurrence":21910325 } , "152484-21913803": { "datetime_modified":"20261030T155140", "datetime_start":"20261102T160000", "datetime_end":"20261102T170000", "has_end_time":1, "date_start":"2026-11-02", "date_end":"2026-11-02", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"GLNT: Modular Character Sheaves and Monodromic Hecke Categories", "occurrence_title":"", "combined_title":"GLNT: Modular Character Sheaves and Monodromic Hecke Categories: Colton Sandvik (JHU)", "event_subtitle":"Colton Sandvik (JHU)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Abstract: Character sheaves provide a geometric framework for studying characters of finite groups of Lie type. Introduced by Lusztig in the 1980s, they played a central role in the classification of irreducible complex representations of these groups and in the computation of their characters. Although the definition of character sheaves can be formulated with modular coefficients, much of Lusztig's characteristic-zero machinery breaks down in this setting.\n\nIn this talk, I will give a streamlined overview of the theory of character sheaves using modern language from categorical representation theory. From this perspective, categorical traces allow one to study character sheaves through monodromic Hecke categories. I will describe two models for these categories: a geometric categorification in terms of parity sheaves and an algebraic categorification in terms of Soergel bimodules. A key advantage of these models is that they are tightly controlled by p-Kazhdan\u2013Lusztig combinatorics. This paves the way for a more algebraic study of modular character sheaves.", "occurrence_notes":null, "guid":"152484-21913803@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/152484", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Group, Lie and Number Theory Seminar - Department of Mathematics", "group_id":"4892", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21913803 } , "154396-21917646": { "datetime_modified":"20261101T133035", "datetime_start":"20261102T160000", "datetime_end":"20261102T170000", "has_end_time":1, "date_start":"2026-11-02", "date_end":"2026-11-02", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"How plabic graphs describe weakly separated collections", "occurrence_title":"", "combined_title":"How plabic graphs describe weakly separated collections: Veronica Lang", "event_subtitle":"Veronica Lang", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Two k-element subsets I,J of {1,2,\u2026,n} are weakly separated if the sets I\\J and J\\I (when drawn on a circle with vertices 1,2,\u2026,n) can be separated by a chord. A maximal weakly separated collection is a set of pairwise weakly-separated k-element subsets of {1,2,\u2026,n} that is not contained in any larger set with this property. This definition gives rise to natural combinatorial questions: How big is a maximal weakly separated collection? How many are there? How are they related to each other?\n\nI will outline how Oh, Posknikov, Speyer answered most of these questions via a bijection between maximal weakly separated collections in a positroid and move-equivalent plabic graphs. Along the way, we\u2019ll meet some fun combinatorial objects related to plabic graphs including bounded affine permutations, Grassmann necklaces, positroids, and plabic tilings.", "occurrence_notes":null, "guid":"154396-21917646@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/154396", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3866", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Student Combinatorics Seminar - Department of Mathematics", "group_id":"4907", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21917646 } , "153397-21915803": { "datetime_modified":"20261102T113259", "datetime_start":"20261102T160000", "datetime_end":"20261102T170000", "has_end_time":1, "date_start":"2026-11-02", "date_end":"2026-11-02", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"ISRMT Seminar: On Hirota's discrete KP equation - from geometry to multiple bi-orthogonal polynomials", "occurrence_title":"", "combined_title":"ISRMT Seminar: On Hirota's discrete KP equation - from geometry to multiple bi-orthogonal polynomials: Adam Doliwa (University of Warmia and Mazury in Olsztyn)", "event_subtitle":"Adam Doliwa (University of Warmia and Mazury in Olsztyn)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Abstract: We generalize the well known connection between the Toda lattice equation, Pade approximants and orthogonal polynomials to the level of the Hirota system. We first present incidence geometric meaning of the multidimensional consistency of the system and its relation to Zamoldchikov's tetrahedron equation. Then we show how Hermite-Pade approximants and multiple orthogonal polynomials provide certain solutions to the Hirota system and its linear problem. Finally, we extend the construction to the case of bi-moments and quasi-determinants.", "occurrence_notes":null, "guid":"153397-21915803@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/153397", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"", "location_name":"Virtual", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Integrable Systems and Random Matrix Theory Seminar - Department of Mathematics", "group_id":"4893", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21915803 } , "141040-21916067": { "datetime_modified":"20261012T153958", "datetime_start":"20261102T160000", "datetime_end":"20261102T171500", "has_end_time":1, "date_start":"2026-11-02", "date_end":"2026-11-02", "time_start":"16:00:00", "time_end":"17:15:00", "time_zone":"America\/Detroit", "event_title":"LSA Transfer Information Session", "occurrence_title":"", "combined_title":"LSA Transfer Information Session: For students planning to apply to LSA as a transfer student.", "event_subtitle":"For students planning to apply to LSA as a transfer student.", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Join the LSA Transfer Recruitment Team for our virtual sessions where we will discuss LSA requirements, transfer credit, pre-transfer academic advising, LSA opportunities and other transfer tidbits.\r\n\r\nRegistration is required. 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