edgar R package 
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 EDGAR stands for Electronic Data Gathering, Analysis, and Retrieval. 
       It is a platform created by the SEC (the Securities and Exchange 
       Commission) to facilitate electronic filing with the agency. 

library(edgar)
getMasterIndex(2020)

path<-"https://www.sec.gov/Archives/"

  Function               Description 
  --------------------   ---------------------------------------
  get8KItems             Retrieves Form 8-K event information
  getBusinDescr          Retrieves business descriptions from annual statements
  getDailyMaster         Retrieves daily master index
  getFilingHeader        Scrape EDGAR filing header information
  getFilingInfo          Retrieves filing information of a firm
  getFilings             Retrieves EDGAR filings from SEC server
  getFilingsHTML	 Get HTML view of EDGAR filings
  getMasterIndex         Retrieves quarterly master index
  getMgmtDisc            Retrieves management's discussion and analysis section
  getSentiment           Provides sentiment measures of EDGAR filings
  LMMasterDictionary     Loughran and McDonald Sentiment Master Dictionary
  searchFilings          Search EDGAR filings for specific keywords

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Search Github: Big Mac Index  
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 Go to this website: https://www.economist.com/big-mac-index

 The big mac index was invented by The Economist in 1986 as a lighthearted guide to 
     whether currencies are at their "correct" level. It is based on the theory of 
     purchasing-power parity (PPP), the notion that in the long run exchange rates 
     should move towards the rate that would equalise the prices of an identical 
     basket of goods and services (in this case, a burger) in any two countries.

 Burgernomics was never intended as a precise gauge of currency misalignment, 
     merely a tool to make exchange-rate theory more digestible. Yet the Big 
     Mac index has become a global standard, included in several economic 
     textbooks and the subject of dozens of academic studies. For those who
     take their fast food more seriously, we also calculate a gourmet version of the index.

 The GDP-adjusted index addresses the criticism that you would expect average burger
    prices to be cheaper in poor countries than in rich ones because labour costs 
    are lower. PPP signals where exchange rates should    be heading in the long 
    run, as a country like China gets richer, but it says little about today's 
    equilibrium rate. The relationship between prices and GDP per person may be 
    a better guide to the current fair value of a currency.
   
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