Question: Arthur Laffer is best know for a curve that illustrates a theoretical relationship between what?
Context: A large body of Western Chalukya literature in Kannada language was produced during the reign of the Western Chalukya Empire (973–1200 CE) in what is now southern India.  This dynasty, which ruled most of the western Deccan in South India is sometimes called the Kalyani Chalukya Dynasty after its royal capital at Kalyani (now Basavakalyan) and sometimes called the Later Chalukya Dynasty for its theoretical relationship to the 6th-century Chalukya dynasty of Badami.  For a brief period (1162–1183), the Kalachuris of Kalyani, a dynasty of kings who had earlier migrated to the Karnataka region from central India and served as vassals for several generations, exploited the growing weakness of their overlords and annexed the Kalyani.  Around 1183, the last Chalukya scion, Someshvara IV, overthrew the Kalachuris to regain control of the royal city.  But his efforts were in vain, as other prominent Chalukya vassals in the Deccan, the Hoysalas, the Kakatiyas and the Seunas destroyed the remnants of the Chalukya power. A turbidostat is a continuous microbiological culture device, similar to a chemostat or an auxostat, which has feedback between the turbidity of the culture vessel and the dilution rate.  The theoretical relationship between growth in a chemostat and growth in a turbidostat is somewhat complex, in part because they are similar.  A chemostat has a fixed volume and flow rate, and thus a fixed dilution rate.  A turbidostat dynamically adjusts the flow rate (and therefore the dilution rate) to make the turbidity constant.  At equilibrium, operation of both the chemostat and turbidostat are identical.  It is only when classical chemostat assumptions are violated (for instance, out of equilibrium; or the cells are mutating) that a turbidostat is functionally different.  One case may be while cells are growing at their maximum growth rate, in which case it is difficult to set a chemostat to the appropriate constant dilution rate. Ideal was an American R&B quartet from Houston, Texas, United States.  The group Ideal debuted in 1999 and is composed of brothers Maverick Cotton and Swab, their cousin PZ and high school friend J-Dante.  The group is best known for its hit songs "Get Gone" and "Whatever."  Ideal also had a 5th member who started with the Original Group in 1992, Charles Vienn II, who now goes by the stage name "EDWIN VICTORY".  He left the group in 1998 to pursue his own musical and entertainment interest.  He is best know for his creation of "The Baby Isaac Crew", a group of mascot characters who do positive and uplifting hip hop songs for kids. Arthur Betz Laffer ( ; born August 14, 1940) is an American economist who first gained prominence during the Reagan administration as a member of Reagan's Economic Policy Advisory Board (1981–89).  Laffer is best known for the Laffer curve, an illustration of the theory that there exists some tax rate between 0% and 100% that will result in maximum tax revenue for governments.  He is the author and co-author of many books and newspaper articles, including "Supply Side Economics: Financial Decision-Making for the 80s".  Laffer is Policy Co-Chairman (with Lawrence "Larry" Kudlow) of the Free Enterprise Fund and serves on the "Board of Scholars" of the American Legislative Exchange Council (ALEC).  Mr Laffer was one of four economists who acted as advisors to Donald Trump's successful 2016 campaign for the presidency of the United States. The Sverdrup balance, or Sverdrup relation, is a theoretical relationship between the wind stress exerted on the surface of the open ocean and the vertically integrated meridional (north-south) transport of ocean water. In economics, the Reverse Laffer curve is a representation of the relationship between rates of purchasing power provided to purchasers through increased corporate taxation and redistribution leading to levels of increased profit for those corporations.  Proponents of the Reverse Laffer curve claim that it illustrates the concept of profit elasticity—i.e., profit will change in response to changes in the rate of taxation. Curve fitting is the process of constructing a curve, or mathematical function, that has the best fit to a series of data points, possibly subject to constraints.  Curve fitting can involve either interpolation, where an exact fit to the data is required, or smoothing, in which a "smooth" function is constructed that approximately fits the data.  A related topic is regression analysis, which focuses more on questions of statistical inference such as how much uncertainty is present in a curve that is fit to data observed with random errors.  Fitted curves can be used as an aid for data visualization, to infer values of a function where no data are available, and to summarize the relationships among two or more variables.  Extrapolation refers to the use of a fitted curve beyond the range of the observed data, and is subject to a degree of uncertainty since it may reflect the method used to construct the curve as much as it reflects the observed data. In botany, a light curve shows the photosynthetic response of leaf tissue or algal communities to varying light intensities.  The shape of the curve illustrates the principle of limiting factors; in low light levels, the rate of photosynthesis is limited by the concentration of chlorophyll and the efficiency of the light-dependent reactions, but in higher light levels it is limited by the efficiency of RuBisCo and the availability of carbon dioxide.  The point on the curve where these two differing slopes meet is called the light saturation point and is where the light-dependent reactions are producing more ATP and NADPH than can be utilized by the light-independent reactions.  Since photosynthesis is also limited by ambient carbon dioxide levels, light curves are often repeated at several different constant carbon dioxide concentrations. In economics, the Laffer curve illustrates a theoretical relationship between rates of taxation and the resulting levels of government revenue.  It illustrates the concept of taxable income elasticity—i.e., taxable income changes in response to changes in the rate of taxation.  The Laffer curve assumes that no tax revenue is raised at the extreme tax rates of 0% and 100%, and that there is a rate between 0% and 100% that maximizes government taxation revenue.  The Laffer curve is typically represented as a graph that starts at 0% tax with zero revenue, rises to a maximum rate of revenue at an intermediate rate of taxation, and then falls again to zero revenue at a 100% tax rate.  However, the shape of the curve is uncertain and disputed among economists. The Western Chalukya Empire ruled most of the western Deccan, South India, between the 10th and 12th centuries.  This Kannadiga dynasty is sometimes called the "Kalyani Chalukya" after its regal capital at Kalyani, today's Basavakalyan in Karnataka and alternatively the "Later Chalukya" from its theoretical relationship to the 6th-century Chalukya dynasty of Badami.  The dynasty is called Western Chalukyas to differentiate from the contemporaneous Eastern Chalukyas of Vengi, a separate dynasty.  Prior to the rise of these Chalukyas, the Rashtrakuta empire of Manyakheta controlled most of Deccan and Central India for over two centuries.  In 973, seeing confusion in the Rashtrakuta empire after a successful invasion of their capital by the ruler of the Paramara dynasty of Malwa, Tailapa II, a feudatory of the Rashtrakuta Dynasty ruling from Bijapur region defeated his overlords and made Manyakheta his capital.  The dynasty quickly rose to power and grew into an empire under Someshvara I who moved the capital to Kalyani.
Answer: rates of taxation and the resulting levels of government revenue