gemShortTermInvestment_2_3: Some Examples Illustrating Short-Term Investment

In GE: General Equilibrium Modeling

Some Examples Illustrating Short-Term Investment

Description

Some examples illustrating short-term investment.

Usage

gemShortTermInvestment_2_3(...)

Arguments

...	arguments to be passed to the function sdm2.

Examples

#### an example with an exogenous investment rate
investment.rate <- 0.2
dst.firm <- node_new("output",
  type = "CD",
  alpha = 2, beta = c(0.5, 0.5),
  "prod", "lab"
)

dst.laborer <- node_new("laborer.util",
  type = "CD",
  alpha = 1, beta = c(0.5, 0.5),
  "prod", "lab"
)

dst.investor <- node_new("investor.util",
  type = "Leontief",
  a = 1,
  "prod"
)

dstl <- list(dst.firm, dst.laborer, dst.investor)

ge <- sdm2(
  A = dstl,
  B = diag(c(1, 0), 2, 3),
  S0Exg = matrix(c(
    NA, NA, NA,
    NA, 100 * (1 - investment.rate), 100 * investment.rate
  ), 2, 3, TRUE),
  names.commodity = c("prod", "lab"),
  names.agent = c("firm", "laborer", "investor"),
  numeraire = "prod"
)

addmargins(ge$D, 2)

## an example with an exogenous investment level
dst.investor$current.investment.rate <- 0.5
investment.level <- 20

ge <- sdm2(
  A = list(dst.firm, dst.laborer, dst.investor),
  B = diag(c(1, 0), 2, 3),
  S0Exg = matrix(c(
    NA, NA, NA,
    NA, 100, 0
  ), 2, 3, TRUE),
  names.commodity = c("prod", "lab"),
  names.agent = c("firm", "laborer", "investor"),
  numeraire = "prod",
  policy = function(time, A, state) {
    A[[3]]$current.investment.rate <- A[[3]]$current.investment.rate *
      (investment.level / state$last.z[3])
    state$S[2, 2] <- 100 * (1 - A[[3]]$current.investment.rate)
    state$S[2, 3] <- 100 * A[[3]]$current.investment.rate
    state
  }
)

addmargins(ge$D, 2)

GE documentation built on Nov. 8, 2023, 9:07 a.m.