Many corporations also contributed to relief efforts. Several factors have contributed to this decline. Nor have social expenses contributed significantly to public debt. Economics has contributed notably through spatial econometrics. However, he also contributed significantly in other areas. Kovner has contributed extensively to conservative causes. Several factors might have contributed to the disaster. Low has contributed money to various charities. Other factors likely also contributed to crew frustration. They listen actively in order to respond effectively to what others have contributed. She has also contributed to and toured with Jarboe of Swans. Shipping has significantly contributed to marine pollution. She also contributed financially to the movement. "Iris" has contributed greatly to the band's success. This may have contributed to his depression.