Indicate the interconnection of a particular sector to other sectors from which it purchases inputs (demand side). When a sector increases its output, it will increase the total (intermediate) demand on all other sectors, which is measured by backward linkages.

## Arguments

- Im
A Leontief inverse matrix created by the

`leontief_inverse_create`

function.

## Value

The vector of industry (product) backward linkages in a wide data.frame class, following the column names of the Leontief inverse matrix.

## Details

Backward linkages are defined as the column sum of the Leontief inverse, in line with the Eurostat Manual of Supply, Use and Input-Output Tables (see p506-507.) and the Handbook on Supply and Use Tables and Input-Output Tables with Extensions and Applications of the United Nations (see p636,)

## See also

Other linkage functions:
`forward_linkages()`

## Examples

```
de_coeff <- input_coefficient_matrix_create( iotable_get(),
digits = 4 )
I <- leontief_inverse_create (de_coeff)
backward_linkages (I)
#> iotables_row agriculture_group industry_group construction trade_group
#> 1 backward linkages 1.704922 1.841421 1.813747 1.603712
#> business_services_group other_services_group
#> 1 1.594974 1.378375
```