. | Estimated additional revenue from raising BOP prisoner telephone call ceiling | ||||

. | For related discussion, see | ||||

. | http://purplemotes.net/2011/09/19/setting-limits-on-prisoners-telephone-calling/ | ||||

. | Excel version of spreadsheet (which shows formulas and can be modified) available here: | ||||

. | http://galbithink.org/prisoners/prisoner-call-limits.xls | ||||

. | |||||

. | source / notes | ||||

. | prisoners in BOP facilities | 177,859 | BOP, weekly population report, BOP facilities | http://www.bop.gov/locations/weekly_report.jsp | |

. | |||||

. | prisoner call cost: | ||||

. | local debit call cost per minute | $0.06 | GAO (2010) p. 15 | ||

. | long-distance call cost per minute | $0.23 | GAO (2010) p. 15 | ||

. | long-distance call share | 84% | GAO (2010) p. 15 | ||

. | ave cost per minute | $0.20 | calculated | ||

. | |||||

. | current limit | 300 | GAO (2010) p. 15 | ||

. | share at current limit | 25% | GAO (2010) p. 18 | ||

. | |||||

. | GAO (2010): Bureau of Prisons: Improved Evaluations and Increased Coordination Could Improve Cell Phone Detection | http://www.gao.gov/products/GAO-11-893 | |||

. | |||||

. | |||||

. | |||||

. | exponential model parameter | 0.004620981203733 | model estimate | ||

. | new limit | 500 | hypothetical | ||

. | |||||

. | ave. minutes | share | calculations | ||

. | between current and new limits | 385 | 15.1% | ||

. | at new limit | 500 | 9.9% | ||

. | |||||

. | additional revenue | $1,176,995 | |||

. | |||||

. | |||||

. | |||||

. | exponential model test | ||||

. | |||||

. | BOP prisoner calling distribution in 1999 | OIG, Criminal Calls (1999) | http://www.justice.gov/oig/special/9908/callsp4.htm#Field | ||

. | less than 300 mins per month | 72% | |||

. | between 300-999 minutes per month | 24% | |||

. | 1000 to 4000 minutes per month | 4% | |||

. | |||||

. | exponential model parameter | 0.004243218919376 | |||

. | est. between 300-999 mins | 27% |