3. To find current data for inflation and unemployment, please visit .pdf

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3. To find current data for inflation and unemployment, please visit the Bureau of Labor Statistics web page at www.bls.gov. On the right side of the home page is a column with "Latest Numbers". a. Click on the chart icon next to "Unemployment Rate". What is the current rate of unemployment? How has the unemployment rate changed since 2013 ? b. Going back to the home page, click on the chart icon next to "Consumer Price Index". What is the current rate of inflation as measured by the CPI? What have been the trends in inflation since 2013 ? c. Going back to the home page, click on "Subjects" and the "Consumer Price Index". Then click on "About CPI > Overview" and answer the following questions: the CPI?.

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3. System Calls A system call is simply a kernel function that a wier application can we to aocess or utilize system rewources. Functions forki), and exec() are well-known ccamples of syatem calls in UNIX and xv6. We will use a simple ceample to walk: you through the steps of adding a new system call to xv6. We name the syset call epdi), which priats out the current running and slecping processet. An application signals the kemel it needs a service by issiing a software internapt, a signal generated to bocify the peoceser that it neds so slop its current takk, and repponse to the signal request. Before switching to handling the new taxk, the proceswor has to save the current state, se that it can resime the execution in this context after the requeat has becn hathllod. The followisg is a code that calls a sysern call in xv6 (found in wibcode 5 ): (iqtobl atare otarti pinh sarge Fwhi binle wo where caller po wosid be Basically, it pushes the aggument of the call to the stack, and puts the systen call number, which is $5YS ewe in the example, into Fiear. All the sysucm call mambers ate sperified and saved in a table and the syacem calls of xv6 can be found ta the flle macall. Next, the code ied ST STSCAL. genctates a software interrupe, indecing the intemupt descriptor table so doeaid the appeopriane incerupt handler. The functive trap() (in map. c) is the specific code than finds the appeopriale imemupt handler. It checks whether the trap number in the penerated tranframe (a senachure representing the processer's stans at the time the erap happened) is cyual to T SYSCAL. If in is, in calls syscallo, the sodtware interrupe handler thar's available in nscalle. The finction syscallo is the final function that checks out Fiear to obeain the system cal's number, which is ward to index the able with the system call poimers and to etecute the code comespoding to that sysuce call: The following are the procedures of adding our evemplary system call cpso to xv6. a. Add name to ngacall.t. Modify Makefile \$vi Makefile UUPROOGS =1 catl -echol forktestl grepl Initl -ki11l Inl Isl mkdirl rml shl stressfsl usertestsl wcl zombiel zcpl EXTTA=1 mifs.c ulib.c user.h cat. c echo.c forktest.c grep.c kill.cl ln.c ls.c mkdir.c rm.c stressfs.c usertests.c wC.c zombie.c cp.c I printf.c umalloc.cl README dot-bochsrc REl toc." runoff runoff1 runoff. 1istl . gdbinit. tmpl gdbutiil Compile and test it with \$inake \$ CP README mYFile $13$ cat myFile.

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3. Producer surplus for a group of sellers The following graph plots a supply curve (orange line) for several sellers in the market for polaroid cameras in College Station, a university town in Texas. Each seller has a single polaroid camera for sale. The market price of polaroid cameras is given by the horizontal black line at $70. Each rectangle on the graph corresponds to a particular seller in this market: blue (circle symbols) for Hubert, green (triangle symbols) for Kate, purple (diamond symbols) for Manuel, tan (dash symbols) for Poornima, and orange (square symbols) for Shen. (Note: The name labels are to the right of the corresponding segment on the supply curve.) Use the rectangles to shade the areas representing producer surplus for each person who is willing to sell a polaroid camera at a market price of $70. (Note: If a person will not sell a polaroid camera at the market price, indicate this by leaving their rectangle in its original position on the palette.) Based on the information on the preceding graph, you can tell that will sell polaroid cameras at the given market price, and total producer surplus in this market will be Suppose the market price of a polaroid camera increases to $110. On the following graph, use the rectangles once again to shade the areas representing producer surplus for each person who is willing to sell a polaroid camera at the new market price: blue (circle symbols) for Hubert, green (triangle symbols) for Kate, purple (diamond symbols) for Manuel, tan (dash symbols) for Poornima, and orange (square symbols) for Shen. (Note: If a person will not sell a polaroid camera at the new market price, indicate this by leaving their rectangle in its original position on the palette.) Based on the information in the second graph, when the market price of a polaroid camera increases to $110, the number of sellers willing to sell a polaroid camera to , and total producer surplus to.

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