6. OTHER CURRENT ASSETS

Other current assets consist of the following:

(US$ in millions)	December 31, 2015		December 31, 2014
Prepaid commodity purchase contracts(1)	$	287	$	153
Secured advances to suppliers, net(2)		521		520
Unrealized gains on derivative contracts, at fair value		1,456		1,569
Recoverable taxes, net		364		349
Margin deposits		467		323
Marketable securities, at fair value and other short-term investments		234		230
Deferred purchase price receivable, at fair value(3)		79		78
Prepaid expenses		132		183
Other		359		400

Total	$	3,899	$	3,805

(1)Prepaid commodity purchase contracts represent advance payments against fixed price contracts for future delivery of specified quantities of agricultural commodities.

(2)Bunge provides cash advances to suppliers, primarily Brazilian farmers of soybeans and sugarcane, to finance a portion of the suppliers' production costs. Bunge does not bear any of the costs or risks associated with the related growing crops. The advances are largely collateralized by future crops and physical assets of the suppliers, carry a local market interest rate and settle when the farmer's crop is harvested and sold. The secured advances to farmers are reported net of allowances of $2 million and $2 million at December 31, 2015 and December 31, 2014, respectively. There were no significant changes in the allowance for 2015. Changes in the allowance for 2014 included primarily a reduction in the allowance resulting from recoveries of $7 million and reclassifications to long-term of $8 million.

Interest earned on secured advances to suppliers of $38 million, $37 million and $32 million, respectively, for the years ended December 31, 2015, 2014 and 2013, respectively, is included in net sales in the consolidated statements of income.

(3)Deferred purchase price receivable represents additional credit support for the investment conduits in Bunge's accounts receivables sales program (see Note 18).

Marketable Securities and Other Short-Term Investments—The Company invests in foreign government securities, corporate debt securities, deposits, and other securities. The following is a summary of amounts recorded on the Consolidated Balance Sheets for marketable securities and other short-term investments.

(US$ in millions)	December 31, 2015		December 31, 2014
Foreign government securities	$	61	$	137
Corporate debt securities		92		25
Certificate of deposits/time deposits		55		46
Other		26		22

Total marketable securities and other short-term investments	$	234	$	230

Total marketable securities and short-term investments as of December 31, 2015 includes $76 million of assets classified as held-to-maturity and $158 million as trading. Total marketable securities and short-term investments as of December 31, 2014 includes $120 million of assets classified as held-to-maturity and $110 million as trading. Held-to-maturity securities and investments are all due in less than a 12 month period and are therefore classified as current. Due to the short term nature of these securities and investments, carrying value approximates fair value. We recognized a net gain of $6 million in 2015, compared to a net gain of $3 million in 2014 for the trading securities.