Robert A. Ritz

University of Cambridge

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H. Soltau

PNDetector (Germany)

C. Pfleiderer

Technical University of Munich

Martin Simson

PNDetector (Germany)

Martin Huth

PNDetector (Germany)

H. Ryll

PNSensor (Germany)

Christian Franz

Technical University of Munich

Rafal E. Dunin‐Borkowski

Ernst Ruska Centre

Achim Rosch

University of Cologne

A. Neubauer

University Medical Centre Mannheim

Sebastian Ihle

University of Potsdam

Cooperative Institutions

Technical University of Munich

University of Oxford

University of Bremen

University of Cambridge

Heinz Maier-Leibnitz Zentrum

Max Planck Society

Forschungszentrum Jülich

Centre National de la Recherche Scientifique

University of California, Berkeley

Lawrence Berkeley National Laboratory

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Measuring Single Electrons – What Does it Mean?

Microscopy and Microanalysis (2019)

H. Ryll Martin Huth Robert A. Ritz Colum M. O’Leary Ian Griffiths

In today´s electron microscopy research, a strong trend towards ultra-low dose experiments is driven by challenging samples, which are beam-sensitive and may charge or deteriorate during the measurement process.Recent experiments indicate that only few electrons passing through the sample already carry enough information to deduce sensitive information like electric or magnetic field distributions.Even quantitative phase contrast imaging is possible with sub-pA beam currents.

10.1017/s1431927619009000

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Citations (1)

How does renewables competition affect forward contracting in electricity markets?

Economics Letters (2016)

Robert A. Ritz

Electricity retailing

Intermittency

Market Penetration

10.1016/j.econlet.2016.07.024

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Citations (14)

An Analysis of OPEC's Strategic Actions, US Shale Growth and the 2014 Oil Price Crash

Alberto Behar Robert A. Ritz

In November 2014, OPEC announced a new strategy geared towards improving its market share. Oil-market analysts interpreted this as an attempt to squeeze higher-cost producers including US shale oil out of the market. Over the next year, crude oil prices crashed, with large repercussions for the global economy. We present a simple equilibrium model that explains the fundamental market factors that can rationalize such a regime switch by OPEC. These include: (i) the growth of US shale oil production; (ii) the slowdown of global oil demand; (iii) reduced cohesiveness of the OPEC cartel; (iv) production ramp-ups in other non-OPEC countries. We show that these qualitative predictions are broadly consistent with oil market developments during 2014-15. The model is calibrated to oil market data; it predicts accommodation up to 2014 and a market-share strategy thereafter, and explains large oil-price swings as well as realistically high levels of OPEC output.

Cartel

Shale oil extraction

Market share

Oil-storage trade

10.5089/9781498351638.001.a001

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4D-STEM at interfaces to GaN: Centre-of-mass approach & NBED-disc detection

Ultramicroscopy (2021)

Tim Grieb Florian F. Krause Knut Müller‐Caspary Robert A. Ritz Martin Simson

10.1016/j.ultramic.2021.113321

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Superconductivity and non-Fermi liquid behavior on the border of itinerant ferromagnetism

Robert A. Ritz

When magnetic order is suppressed under pressure, a superconducting (SC) phase emerges in the ferromagnet UGe2 and an extended non-Fermi liquid (NFL) regime is observed in the helimagnet MnSi. We report thermal expansion measurements of UGe2 under pressure by means of neutron Larmor diffraction. We find a new, putatively non-magnetic transition at the temperature TL at pressures close to the SC phase. In MnSi we report Hall effect measurements under pressure. We find a topological Hall effect, as the signature of a topologically non-trivial spin texture, above the critical pressure in the NFL regime.

Ambient pressure

Texture (cosmology)

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Citations (2)

Thermal Hall effect in the underdoped cuprate superconductor YBa$_2$Cu$_3$O$_{6.5}$

Bulletin of the American Physical Society (2013)

Phuan Ong Max Hirschberger Tian Liang T. Loew Wei‐Li Lee

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Oligopolistic competition and welfare

Chapters (2018)

Robert A. Ritz

This chapter provides a selective survey of recent developments in the study of social welfare under oligopoly. The main topics covered are (i) the rate of cost pass-through as a tool to analyze market performance; (ii) the quantification of welfare losses due to market power in Cournot-style models; and (iii) new results from models with endogenous entry. The chapter highlights common themes across these topics and identifies areas for future research.

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Neutron scattering studies of ferromagnetic superconductor UGe$_{2}$ under pressure

Bulletin of the American Physical Society (2010)

D. A. Sokolov A. Huxley Robert A. Ritz C. Pfleiderer T. Keller

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Cost Pass-Through under Delegation

The B E Journal of Theoretical Economics (2009)

Robert A. Ritz

The rate of cost pass-through exceeds 50% under strategic delegation of decision-making to managers with sales revenue contractsregardless of the number of firms in the industry and demand curvature. This contrasts sharply with profit-maximization, for which cost pass-through can take on any positive value. The key intuition is that firms under delegation act as if they faced more rivals than they actually do, thus pushing cost pass-through towards 100%. Cost pass-through with market share contracts is similarly bounded below, and this note also generalizes existing results on equilibrium characterization for this case.

Delegation

Intuition

Profit maximization

Maximization

10.2202/1935-1704.1383

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Citations (1)

The Simple Economics of Asymmetric Cost Pass-Through

RePEc: Research Papers in Economics (2015)

Robert A. Ritz

In response to cost changes, prices often rise more strongly or quickly than they fall. This phenomenon has attracted attention from economists, policymakers, and the general public for decades. Many assert that it cannot be explained by standard economic theory, and is evidence for “anti-competitive”behaviour by …rms. This paper argues against this conventional wisdom; it shows that simple price theory can, in principle, account for such asymmetric pass-through— even with perfect competition. From a policy perspective, knowledge of cost pass-through patterns in a market does not allow for strong inferences on the intensity of competition.

Phenomenon

Perfect competition

10.17863/cam.5706

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Citations (5)